390424321 has 16 divisors (see below), whose sum is σ = 451991680. Its totient is φ = 330324480.

The previous prime is 390424319. The next prime is 390424351. The reversal of 390424321 is 123424093.

It is a cyclic number.

It is not a de Polignac number, because 390424321 - 2¹ = 390424319 is a prime.

It is a super-2 number, since 2×390424321² = 304862300856622082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 390424321.

It is not an unprimeable number, because it can be changed into a prime (390424301) 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 15 ways as a sum of consecutive naturals, for example, 481006 + ... + 481816.

It is an arithmetic number, because the mean of its divisors is an integer number (28249480).

Almost surely, 2^390424321 is an apocalyptic number.

It is an amenable number.

390424321 is a deficient number, since it is larger than the sum of its proper divisors (61567359).

390424321 is an equidigital number, since it uses as much as digits as its factorization.

390424321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 390424321 is about 19759.1579020969. The cubic root of 390424321 is about 730.8792314664.

The spelling of 390424321 in words is "three hundred ninety million, four hundred twenty-four thousand, three hundred twenty-one".