390444520 has 32 divisors (see below), whose sum is σ = 884925000. Its totient is φ = 155035648.

The previous prime is 390444511. The next prime is 390444553. The reversal of 390444520 is 25444093.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 382046116 + 8398404 = 19546^2 + 2898^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30145 + ... + 41104.

Almost surely, 2^390444520 is an apocalyptic number.

It is an amenable number.

390444520 is an abundant number, since it is smaller than the sum of its proper divisors (494480480).

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

390444520 is a wasteful number, since it uses less digits than its factorization.

390444520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71397 (or 71393 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 390444520 is about 19759.6690255682. The cubic root of 390444520 is about 730.8918355095.

The spelling of 390444520 in words is "three hundred ninety million, four hundred forty-four thousand, five hundred twenty".