399261790 has 8 divisors (see below), whose sum is σ = 718671240. Its totient is φ = 159704712.

The previous prime is 399261781. The next prime is 399261917. The reversal of 399261790 is 97162993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 399261790.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19963080 + ... + 19963099.

It is an arithmetic number, because the mean of its divisors is an integer number (89833905).

Almost surely, 2^399261790 is an apocalyptic number.

399261790 is a deficient number, since it is larger than the sum of its proper divisors (319409450).

399261790 is a wasteful number, since it uses less digits than its factorization.

399261790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39926186.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 399261790 is about 19981.5362272274. The cubic root of 399261790 is about 736.3527557892.

The spelling of 399261790 in words is "three hundred ninety-nine million, two hundred sixty-one thousand, seven hundred ninety".