399199792337 has 4 divisors (see below), whose sum is σ = 399267677796. Its totient is φ = 399131906880.

The previous prime is 399199792319. The next prime is 399199792339. The reversal of 399199792337 is 733297991993.

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 257552190016 + 141647602321 = 507496^2 + 376361^2 .

It is a cyclic number.

It is not a de Polignac number, because 399199792337 - 2²² = 399195598033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399199792339) 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, 33933908 + ... + 33945669.

It is an arithmetic number, because the mean of its divisors is an integer number (99816919449).

Almost surely, 2^399199792337 is an apocalyptic number.

It is an amenable number.

399199792337 is a deficient number, since it is larger than the sum of its proper divisors (67885459).

399199792337 is an equidigital number, since it uses as much as digits as its factorization.

399199792337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67885458.

The product of its digits is 156243654, while the sum is 71.

The spelling of 399199792337 in words is "three hundred ninety-nine billion, one hundred ninety-nine million, seven hundred ninety-two thousand, three hundred thirty-seven".