399313631911 has 4 divisors (see below), whose sum is σ = 416675094192. Its totient is φ = 381952169632.

The previous prime is 399313631903. The next prime is 399313631923. The reversal of 399313631911 is 119136313993.

It is a happy number.

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 399313631911 - 2³ = 399313631903 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399313631971) 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, 8680731106 + ... + 8680731151.

It is an arithmetic number, because the mean of its divisors is an integer number (104168773548).

Almost surely, 2^399313631911 is an apocalyptic number.

399313631911 is a deficient number, since it is larger than the sum of its proper divisors (17361462281).

399313631911 is a wasteful number, since it uses less digits than its factorization.

399313631911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17361462280.

The product of its digits is 354294, while the sum is 49.

The spelling of 399313631911 in words is "three hundred ninety-nine billion, three hundred thirteen million, six hundred thirty-one thousand, nine hundred eleven".