399313512 has 96 divisors (see below), whose sum is σ = 1171595880. Its totient is φ = 122135040.

The previous prime is 399313507. The next prime is 399313513. The reversal of 399313512 is 215313993.

It can be written as a sum of positive squares in 4 ways, for example, as 81974916 + 317338596 = 9054^2 + 17814^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (399313513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168238 + ... + 170594.

Almost surely, 2^399313512 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 399313512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585797940).

399313512 is an abundant number, since it is smaller than the sum of its proper divisors (772282368).

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

399313512 is a wasteful number, since it uses less digits than its factorization.

399313512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563 (or 2556 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 399313512 is about 19982.8304301468. The cubic root of 399313512 is about 736.3845511289.

The spelling of 399313512 in words is "three hundred ninety-nine million, three hundred thirteen thousand, five hundred twelve".