399707808913 has 4 divisors (see below), whose sum is σ = 456808924480. Its totient is φ = 342606693348.

The previous prime is 399707808887. The next prime is 399707808937. The reversal of 399707808913 is 319808707993.

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-399707808913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399707808013) 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, 28550557773 + ... + 28550557786.

It is an arithmetic number, because the mean of its divisors is an integer number (114202231120).

Almost surely, 2^399707808913 is an apocalyptic number.

It is an amenable number.

399707808913 is a deficient number, since it is larger than the sum of its proper divisors (57101115567).

399707808913 is an equidigital number, since it uses as much as digits as its factorization.

399707808913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57101115566.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 399707808913 in words is "three hundred ninety-nine billion, seven hundred seven million, eight hundred eight thousand, nine hundred thirteen".