3939908515956 has 864 divisors, whose sum is σ = 13022426761344. Its totient is φ = 1034643456000.

The previous prime is 3939908515943. The next prime is 3939908515987. The reversal of 3939908515956 is 6595158099393.

3939908515956 is a `hidden beast` number, since 3 + 9 + 399 + 0 + 85 + 159 + 5 + 6 = 666.

It is a super-2 number, since 2×3939908515956² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 11903046711 + ... + 11903047041.

It is an arithmetic number, because the mean of its divisors is an integer number (15072253196).

Almost surely, 2^{3939908515956} is an apocalyptic number.

3939908515956 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3939908515956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6511213380672).

3939908515956 is an abundant number, since it is smaller than the sum of its proper divisors (9082518245388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3939908515956 is a wasteful number, since it uses less digits than its factorization.

3939908515956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 662 counting only the distinct ones).

The product of its (nonzero) digits is 354294000, while the sum is 72.

The spelling of 3939908515956 in words is "three trillion, nine hundred thirty-nine billion, nine hundred eight million, five hundred fifteen thousand, nine hundred fifty-six".