390933918 has 16 divisors (see below), whose sum is σ = 868742160. Its totient is φ = 130311288.

The previous prime is 390933899. The next prime is 390933919. The reversal of 390933918 is 819339093.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390933919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3619705 + ... + 3619812.

It is an arithmetic number, because the mean of its divisors is an integer number (54296385).

Almost surely, 2^390933918 is an apocalyptic number.

390933918 is an abundant number, since it is smaller than the sum of its proper divisors (477808242).

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

390933918 is a wasteful number, since it uses less digits than its factorization.

390933918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7239528 (or 7239522 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 390933918 is about 19772.0489074855. The cubic root of 390933918 is about 731.1970838763.

The spelling of 390933918 in words is "three hundred ninety million, nine hundred thirty-three thousand, nine hundred eighteen".