391213056 has 208 divisors, whose sum is σ = 1174261760. Its totient is φ = 115015680.

The previous prime is 391213001. The next prime is 391213063. The reversal of 391213056 is 650312193.

It is a tau number, because it is divible by the number of its divisors (208).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4952025 + ... + 4952103.

Almost surely, 2^391213056 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 391213056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (587130880).

391213056 is an abundant number, since it is smaller than the sum of its proper divisors (783048704).

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

391213056 is a wasteful number, since it uses less digits than its factorization.

391213056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 391213056 is about 19779.1065521171. The cubic root of 391213056 is about 731.3710743494.

The spelling of 391213056 in words is "three hundred ninety-one million, two hundred thirteen thousand, fifty-six".