390917938 has 16 divisors (see below), whose sum is σ = 592026624. Its totient is φ = 193581360.

The previous prime is 390917929. The next prime is 390917939. The reversal of 390917938 is 839719093.

It is a junction number, because it is equal to n+sod(n) for n = 390917891 and 390917900.

It is not an unprimeable number, because it can be changed into a prime (390917939) 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, 209128 + ... + 210988.

It is an arithmetic number, because the mean of its divisors is an integer number (37001664).

Almost surely, 2^390917938 is an apocalyptic number.

390917938 is a deficient number, since it is larger than the sum of its proper divisors (201108686).

390917938 is a wasteful number, since it uses less digits than its factorization.

390917938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 390917938 is about 19771.6447975377. The cubic root of 390917938 is about 731.1871208211.

The spelling of 390917938 in words is "three hundred ninety million, nine hundred seventeen thousand, nine hundred thirty-eight".