399752568 has 96 divisors (see below), whose sum is σ = 1105453440. Its totient is φ = 130478400.

The previous prime is 399752557. The next prime is 399752611. The reversal of 399752568 is 865257993.

399752568 is a `hidden beast` number, since 3 + 9 + 9 + 75 + 2 + 568 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 902155 + ... + 902597.

It is an arithmetic number, because the mean of its divisors is an integer number (11515140).

Almost surely, 2^399752568 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 399752568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (552726720).

399752568 is an abundant number, since it is smaller than the sum of its proper divisors (705700872).

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

399752568 is a wasteful number, since it uses less digits than its factorization.

399752568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 682 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The square root of 399752568 is about 19993.8132431010. The cubic root of 399752568 is about 736.6543438445.

It can be divided in two parts, 3997 and 52568, that added together give a palindrome (56565).

The spelling of 399752568 in words is "three hundred ninety-nine million, seven hundred fifty-two thousand, five hundred sixty-eight".