391974536156 has 96 divisors (see below), whose sum is σ = 829123018752. Its totient is φ = 158597637120.

The previous prime is 391974536147. The next prime is 391974536167. The reversal of 391974536156 is 651635479193.

It is a super-2 number, since 2×391974536156² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 391974536095 and 391974536104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12753800 + ... + 12784496.

It is an arithmetic number, because the mean of its divisors is an integer number (8636698112).

Almost surely, 2^391974536156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391974536156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414561509376).

391974536156 is an abundant number, since it is smaller than the sum of its proper divisors (437148482596).

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

391974536156 is a wasteful number, since it uses less digits than its factorization.

391974536156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31099 (or 31097 counting only the distinct ones).

The product of its digits is 18370800, while the sum is 59.

The spelling of 391974536156 in words is "three hundred ninety-one billion, nine hundred seventy-four million, five hundred thirty-six thousand, one hundred fifty-six".