399476020 has 48 divisors (see below), whose sum is σ = 873069120. Its totient is φ = 153409536.

The previous prime is 399476017. The next prime is 399476041. The reversal of 399476020 is 20674993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46804 + ... + 54676.

It is an arithmetic number, because the mean of its divisors is an integer number (18188940).

Almost surely, 2^399476020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399476020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (436534560).

399476020 is an abundant number, since it is smaller than the sum of its proper divisors (473593100).

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

399476020 is a wasteful number, since it uses less digits than its factorization.

399476020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7984 (or 7982 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 399476020 is about 19986.8962072654. The cubic root of 399476020 is about 736.4844326731.

The spelling of 399476020 in words is "three hundred ninety-nine million, four hundred seventy-six thousand, twenty".