399323240 has 64 divisors (see below), whose sum is σ = 962962560. Its totient is φ = 148642560.

The previous prime is 399323227. The next prime is 399323261. The reversal of 399323240 is 42323993.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 399323240.

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, 28175 + ... + 39905.

It is an arithmetic number, because the mean of its divisors is an integer number (15046290).

Almost surely, 2^399323240 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 399323240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481481280).

399323240 is an abundant number, since it is smaller than the sum of its proper divisors (563639320).

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

399323240 is a wasteful number, since it uses less digits than its factorization.

399323240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11802 (or 11798 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 399323240 is about 19983.0738376257. The cubic root of 399323240 is about 736.3905309673.

The spelling of 399323240 in words is "three hundred ninety-nine million, three hundred twenty-three thousand, two hundred forty".