390521924 has 24 divisors (see below), whose sum is σ = 736685208. Its totient is φ = 180069120.

The previous prime is 390521921. The next prime is 390521927. The reversal of 390521924 is 429125093.

It is an interprime number because it is at equal distance from previous prime (390521921) and next prime (390521927).

It can be written as a sum of positive squares in 4 ways, for example, as 76877824 + 313644100 = 8768^2 + 17710^2 .

It is not an unprimeable number, because it can be changed into a prime (390521921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63464 + ... + 69344.

It is an arithmetic number, because the mean of its divisors is an integer number (30695217).

Almost surely, 2^390521924 is an apocalyptic number.

It is an amenable number.

390521924 is a deficient number, since it is larger than the sum of its proper divisors (346163284).

390521924 is a wasteful number, since it uses less digits than its factorization.

390521924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175 (or 7173 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 390521924 is about 19761.6275645504. The cubic root of 390521924 is about 730.9401310724.

The spelling of 390521924 in words is "three hundred ninety million, five hundred twenty-one thousand, nine hundred twenty-four".