399872278 has 16 divisors (see below), whose sum is σ = 646596720. Its totient is φ = 184370976.

The previous prime is 399872269. The next prime is 399872279. The reversal of 399872278 is 872278993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399872279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20601 + ... + 34987.

It is an arithmetic number, because the mean of its divisors is an integer number (40412295).

Almost surely, 2^399872278 is an apocalyptic number.

399872278 is a deficient number, since it is larger than the sum of its proper divisors (246724442).

399872278 is a wasteful number, since it uses less digits than its factorization.

399872278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15471.

The product of its digits is 3048192, while the sum is 55.

The square root of 399872278 is about 19996.8066950701. The cubic root of 399872278 is about 736.7278694012.

The spelling of 399872278 in words is "three hundred ninety-nine million, eight hundred seventy-two thousand, two hundred seventy-eight".