399710379 has 4 divisors (see below), whose sum is σ = 532947176. Its totient is φ = 266473584.

The previous prime is 399710359. The next prime is 399710387. The reversal of 399710379 is 973017993.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 399710379 - 2⁵ = 399710347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399710359) 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, 66618394 + ... + 66618399.

It is an arithmetic number, because the mean of its divisors is an integer number (133236794).

Almost surely, 2^399710379 is an apocalyptic number.

399710379 is a deficient number, since it is larger than the sum of its proper divisors (133236797).

399710379 is a wasteful number, since it uses less digits than its factorization.

399710379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133236796.

The product of its (nonzero) digits is 321489, while the sum is 48.

The square root of 399710379 is about 19992.7581638952. The cubic root of 399710379 is about 736.6284279772.

The spelling of 399710379 in words is "three hundred ninety-nine million, seven hundred ten thousand, three hundred seventy-nine".