391490572 has 12 divisors (see below), whose sum is σ = 747391176. Its totient is φ = 177950240.

The previous prime is 391490557. The next prime is 391490579. The reversal of 391490572 is 275094193.

It is not an unprimeable number, because it can be changed into a prime (391490579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448713 + ... + 4448800.

It is an arithmetic number, because the mean of its divisors is an integer number (62282598).

Almost surely, 2^391490572 is an apocalyptic number.

It is an amenable number.

391490572 is a deficient number, since it is larger than the sum of its proper divisors (355900604).

391490572 is a wasteful number, since it uses less digits than its factorization.

391490572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8897528 (or 8897526 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 391490572 is about 19786.1206910299. The cubic root of 391490572 is about 731.5439717836.

The spelling of 391490572 in words is "three hundred ninety-one million, four hundred ninety thousand, five hundred seventy-two".