399379955 has 12 divisors (see below), whose sum is σ = 518958720. Its totient is φ = 294926112.

The previous prime is 399379927. The next prime is 399379973. The reversal of 399379955 is 559973993.

It is not a de Polignac number, because 399379955 - 2⁸ = 399379699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399379894 and 399379903.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235475 + ... + 237164.

It is an arithmetic number, because the mean of its divisors is an integer number (43246560).

Almost surely, 2^399379955 is an apocalyptic number.

399379955 is a deficient number, since it is larger than the sum of its proper divisors (119578765).

399379955 is a wasteful number, since it uses less digits than its factorization.

399379955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472670 (or 472657 counting only the distinct ones).

The product of its digits is 10333575, while the sum is 59.

The square root of 399379955 is about 19984.4928632177. The cubic root of 399379955 is about 736.4253919585.

The spelling of 399379955 in words is "three hundred ninety-nine million, three hundred seventy-nine thousand, nine hundred fifty-five".