390999424 has 32 divisors (see below), whose sum is σ = 800006400. Its totient is φ = 190213632.

The previous prime is 390999359. The next prime is 390999443. The reversal of 390999424 is 424999093.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 36544 + ... + 46015.

It is an arithmetic number, because the mean of its divisors is an integer number (25000200).

Almost surely, 2^390999424 is an apocalyptic number.

It is an amenable number.

390999424 is an abundant number, since it is smaller than the sum of its proper divisors (409006976).

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

390999424 is an equidigital number, since it uses as much as digits as its factorization.

390999424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82610 (or 82598 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 390999424 is about 19773.7053684938. The cubic root of 390999424 is about 731.2379220836.

The spelling of 390999424 in words is "three hundred ninety million, nine hundred ninety-nine thousand, four hundred twenty-four".