399872040 has 32 divisors (see below), whose sum is σ = 1199616480. Its totient is φ = 106632512.

The previous prime is 399872023. The next prime is 399872041. The reversal of 399872040 is 40278993.

It is a junction number, because it is equal to n+sod(n) for n = 399871983 and 399872001.

It is not an unprimeable number, because it can be changed into a prime (399872041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666014 + ... + 1666253.

It is an arithmetic number, because the mean of its divisors is an integer number (37488015).

Almost surely, 2^399872040 is an apocalyptic number.

399872040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399872040 is an abundant number, since it is smaller than the sum of its proper divisors (799744440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399872040 is a wasteful number, since it uses less digits than its factorization.

399872040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332281 (or 3332277 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 399872040 is about 19996.8007441190. The cubic root of 399872040 is about 736.7277232368.

The spelling of 399872040 in words is "three hundred ninety-nine million, eight hundred seventy-two thousand, forty".