399931907759 has 4 divisors (see below), whose sum is σ = 403891629720. Its totient is φ = 395972185800.

The previous prime is 399931907747. The next prime is 399931907761. The reversal of 399931907759 is 957709139993.

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

It is a cyclic number.

It is not a de Polignac number, because 399931907759 - 2⁴ = 399931907743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399931907692 and 399931907701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399931907719) 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, 1979860829 + ... + 1979861030.

It is an arithmetic number, because the mean of its divisors is an integer number (100972907430).

Almost surely, 2^399931907759 is an apocalyptic number.

399931907759 is a deficient number, since it is larger than the sum of its proper divisors (3959721961).

399931907759 is a wasteful number, since it uses less digits than its factorization.

399931907759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959721960.

The product of its (nonzero) digits is 130203045, while the sum is 71.

The spelling of 399931907759 in words is "three hundred ninety-nine billion, nine hundred thirty-one million, nine hundred seven thousand, seven hundred fifty-nine".