3899996975281 has 45 divisors (see below), whose sum is σ = 4532918469705. Its totient is φ = 3354938884440.

The previous prime is 3899996975239. The next prime is 3899996975351. The reversal of 3899996975281 is 1825796999983.

The square root of 3899996975281 is 1974841.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 3899996975281 - 2²⁵ = 3899963420849 is a prime.

It is a super-2 number, since 2×3899996975281² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3899996970281) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4540159030 + ... + 4540159888.

It is an arithmetic number, because the mean of its divisors is an integer number (100731521549).

Almost surely, 2^{3899996975281} is an apocalyptic number.

3899996975281 is the 1974841-st square number.

3899996975281 is the 987421-st centered octagonal number.

It is an amenable number.

3899996975281 is a deficient number, since it is larger than the sum of its proper divisors (632921494424).

3899996975281 is an frugal number, since it uses more digits than its factorization.

3899996975281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 889 counting only the distinct ones).

The product of its digits is 4761711360, while the sum is 85.

The spelling of 3899996975281 in words is "three trillion, eight hundred ninety-nine billion, nine hundred ninety-six million, nine hundred seventy-five thousand, two hundred eighty-one".