391237056 has 168 divisors, whose sum is σ = 1349329280. Its totient is φ = 105878016.

The previous prime is 391237039. The next prime is 391237163. The reversal of 391237056 is 650732193.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 391237056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74055 + ... + 79161.

Almost surely, 2^391237056 is an apocalyptic number.

391237056 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 391237056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674664640).

391237056 is an abundant number, since it is smaller than the sum of its proper divisors (958092224).

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

391237056 is a wasteful number, since it uses less digits than its factorization.

391237056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151 (or 5138 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 391237056 is about 19779.7132436241. The cubic root of 391237056 is about 731.3860300081.

The spelling of 391237056 in words is "three hundred ninety-one million, two hundred thirty-seven thousand, fifty-six".