390721812 has 48 divisors (see below), whose sum is σ = 1039574592. Its totient is φ = 113149440.

The previous prime is 390721811. The next prime is 390721831. The reversal of 390721812 is 218127093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390721811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71014 + ... + 76317.

It is an arithmetic number, because the mean of its divisors is an integer number (21657804).

Almost surely, 2^390721812 is an apocalyptic number.

It is an amenable number.

390721812 is an abundant number, since it is smaller than the sum of its proper divisors (648852780).

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

390721812 is a wasteful number, since it uses less digits than its factorization.

390721812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147368 (or 147366 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 390721812 is about 19766.6843957200. The cubic root of 390721812 is about 731.0648199660.

The spelling of 390721812 in words is "three hundred ninety million, seven hundred twenty-one thousand, eight hundred twelve".