390890756 has 6 divisors (see below), whose sum is σ = 684058830. Its totient is φ = 195445376.

The previous prime is 390890737. The next prime is 390890767. The reversal of 390890756 is 657098093.

It can be written as a sum of positive squares in only one way, i.e., 338560000 + 52330756 = 18400^2 + 7234^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 390890756.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48861341 + ... + 48861348.

It is an arithmetic number, because the mean of its divisors is an integer number (114009805).

Almost surely, 2^390890756 is an apocalyptic number.

It is an amenable number.

390890756 is a deficient number, since it is larger than the sum of its proper divisors (293168074).

390890756 is a wasteful number, since it uses less digits than its factorization.

390890756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97722693 (or 97722691 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 390890756 is about 19770.9573870362. The cubic root of 390890756 is about 731.1701730280.

The spelling of 390890756 in words is "three hundred ninety million, eight hundred ninety thousand, seven hundred fifty-six".