391474720 has 288 divisors, whose sum is σ = 1216228608. Its totient is φ = 117798912.

The previous prime is 391474679. The next prime is 391474739. The reversal of 391474720 is 27474193.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 391474720.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2344077 + ... + 2344243.

It is an arithmetic number, because the mean of its divisors is an integer number (4223016).

Almost surely, 2^391474720 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 391474720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608114304).

391474720 is an abundant number, since it is smaller than the sum of its proper divisors (824753888).

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

391474720 is a wasteful number, since it uses less digits than its factorization.

391474720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 391474720 is about 19785.7201031451. The cubic root of 391474720 is about 731.5340979046.

The spelling of 391474720 in words is "three hundred ninety-one million, four hundred seventy-four thousand, seven hundred twenty".