399513024 has 84 divisors (see below), whose sum is σ = 1161379440. Its totient is φ = 131281920.

The previous prime is 399513017. The next prime is 399513029. The reversal of 399513024 is 420315993.

It is a happy number.

It is a super-2 number, since 2×399513024² = 319221312691249152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 399513024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399513029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36012 + ... + 45780.

Almost surely, 2^399513024 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 399513024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580689720).

399513024 is an abundant number, since it is smaller than the sum of its proper divisors (761866416).

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

399513024 is a wasteful number, since it uses less digits than its factorization.

399513024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9858 (or 9845 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 399513024 is about 19987.8218923423. The cubic root of 399513024 is about 736.5071724849.

The spelling of 399513024 in words is "three hundred ninety-nine million, five hundred thirteen thousand, twenty-four".