399719513329 has 4 divisors (see below), whose sum is σ = 400980458484. Its totient is φ = 398458568176.

The previous prime is 399719513321. The next prime is 399719513341. The reversal of 399719513329 is 923315917993.

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 123779423329 + 275940090000 = 351823^2 + 525300^2 .

It is a cyclic number.

It is not a de Polignac number, because 399719513329 - 2³ = 399719513321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399719513321) 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, 630472102 + ... + 630472735.

It is an arithmetic number, because the mean of its divisors is an integer number (100245114621).

Almost surely, 2^399719513329 is an apocalyptic number.

It is an amenable number.

399719513329 is a deficient number, since it is larger than the sum of its proper divisors (1260945155).

399719513329 is a wasteful number, since it uses less digits than its factorization.

399719513329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260945154.

The product of its digits is 12400290, while the sum is 61.

The spelling of 399719513329 in words is "three hundred ninety-nine billion, seven hundred nineteen million, five hundred thirteen thousand, three hundred twenty-nine".