399575009 has 4 divisors (see below), whose sum is σ = 400256304. Its totient is φ = 398893716.

The previous prime is 399574999. The next prime is 399575047. The reversal of 399575009 is 900575993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399575009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399575509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339767 + ... + 340940.

It is an arithmetic number, because the mean of its divisors is an integer number (100064076).

Almost surely, 2^399575009 is an apocalyptic number.

It is an amenable number.

399575009 is a deficient number, since it is larger than the sum of its proper divisors (681295).

399575009 is an equidigital number, since it uses as much as digits as its factorization.

399575009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681294.

The product of its (nonzero) digits is 382725, while the sum is 47.

The square root of 399575009 is about 19989.3724013537. The cubic root of 399575009 is about 736.5452605517.

The spelling of 399575009 in words is "three hundred ninety-nine million, five hundred seventy-five thousand, nine".