3999

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 3 (3 unique) factors are:
3
31
43

Its 8 divisors are:
1
3
31
43
93
129
1333
3999
Its aliquote sum is:
1633
makeing it a deficient number.

As Unicode codepoint (since version 2.0) this number represents this character:ྟ TIBETAN SUBJOINED LETTER TA in Tibetan (Source: https://ucdapi.org/unicode/latest/codepoint/dec/3999); HTML: ྟ

The number appears at position 8526 of the decimal digits of π surrounded by
05355984917541738188399944697486762655165827 Source: The Pi-Search Page

Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 794.168ms; cpu: 80.410999999998ms)