390815933 has 2 divisors, whose sum is σ = 390815934. Its totient is φ = 390815932.

The previous prime is 390815899. The next prime is 390815947. The reversal of 390815933 is 339518093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388168804 + 2647129 = 19702^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 390815933 - 2¹⁸ = 390553789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390815983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195407966 + 195407967.

It is an arithmetic number, because the mean of its divisors is an integer number (195407967).

Almost surely, 2^390815933 is an apocalyptic number.

It is an amenable number.

390815933 is a deficient number, since it is larger than the sum of its proper divisors (1).

390815933 is an equidigital number, since it uses as much as digits as its factorization.

390815933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 390815933 is about 19769.0650512360. The cubic root of 390815933 is about 731.1235173354.

The spelling of 390815933 in words is "three hundred ninety million, eight hundred fifteen thousand, nine hundred thirty-three".