399600013 has 4 divisors (see below), whose sum is σ = 412490368. Its totient is φ = 386709660.

The previous prime is 399600007. The next prime is 399600017. The reversal of 399600013 is 310006993.

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-399600013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 12890323 = 399600013 / (3 + 9 + 9 + 6 + 0 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399600017) 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, 6445131 + ... + 6445192.

It is an arithmetic number, because the mean of its divisors is an integer number (103122592).

Almost surely, 2^399600013 is an apocalyptic number.

It is an amenable number.

399600013 is a deficient number, since it is larger than the sum of its proper divisors (12890355).

399600013 is a wasteful number, since it uses less digits than its factorization.

399600013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12890354.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 399600013 is about 19989.9978239118. The cubic root of 399600013 is about 736.5606237027.

The spelling of 399600013 in words is "three hundred ninety-nine million, six hundred thousand, thirteen".