390921199 has 4 divisors (see below), whose sum is σ = 390960864. Its totient is φ = 390881536.

The previous prime is 390921187. The next prime is 390921217. The reversal of 390921199 is 991129093.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 390921199 - 2¹⁵ = 390888431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390922199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7599 + ... + 28975.

It is an arithmetic number, because the mean of its divisors is an integer number (97740216).

Almost surely, 2^390921199 is an apocalyptic number.

390921199 is a deficient number, since it is larger than the sum of its proper divisors (39665).

390921199 is a wasteful number, since it uses less digits than its factorization.

390921199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39664.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 390921199 is about 19771.7272639494. The cubic root of 390921199 is about 731.1891539798.

The spelling of 390921199 in words is "three hundred ninety million, nine hundred twenty-one thousand, one hundred ninety-nine".