391408072 has 16 divisors (see below), whose sum is σ = 800607600. Its totient is φ = 177912720.

The previous prime is 391408063. The next prime is 391408091. The reversal of 391408072 is 270804193.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2223822 + ... + 2223997.

It is an arithmetic number, because the mean of its divisors is an integer number (50037975).

Almost surely, 2^391408072 is an apocalyptic number.

It is an amenable number.

391408072 is an abundant number, since it is smaller than the sum of its proper divisors (409199528).

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

391408072 is a wasteful number, since it uses less digits than its factorization.

391408072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4447836 (or 4447832 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 391408072 is about 19784.0357864618. The cubic root of 391408072 is about 731.4925813441.

The spelling of 391408072 in words is "three hundred ninety-one million, four hundred eight thousand, seventy-two".