399524929 has 4 divisors (see below), whose sum is σ = 406074580. Its totient is φ = 392975280.

The previous prime is 399524903. The next prime is 399524933. The reversal of 399524929 is 929425993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 202066225 + 197458704 = 14215^2 + 14052^2 .

It is a cyclic number.

It is not a de Polignac number, because 399524929 - 2⁵ = 399524897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399524959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3274734 + ... + 3274855.

It is an arithmetic number, because the mean of its divisors is an integer number (101518645).

Almost surely, 2^399524929 is an apocalyptic number.

It is an amenable number.

399524929 is a deficient number, since it is larger than the sum of its proper divisors (6549651).

399524929 is an equidigital number, since it uses as much as digits as its factorization.

399524929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6549650.

The product of its digits is 1574640, while the sum is 52.

The square root of 399524929 is about 19988.1196964597. The cubic root of 399524929 is about 736.5144880835.

The spelling of 399524929 in words is "three hundred ninety-nine million, five hundred twenty-four thousand, nine hundred twenty-nine".