399371738951 has 4 divisors (see below), whose sum is σ = 412254698304. Its totient is φ = 386488779600.

The previous prime is 399371738929. The next prime is 399371738977. The reversal of 399371738951 is 159837173993.

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 399371738951 - 2¹⁰ = 399371737927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399371738921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6441479630 + ... + 6441479691.

It is an arithmetic number, because the mean of its divisors is an integer number (103063674576).

Almost surely, 2^399371738951 is an apocalyptic number.

399371738951 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

399371738951 is a deficient number, since it is larger than the sum of its proper divisors (12882959353).

399371738951 is a wasteful number, since it uses less digits than its factorization.

399371738951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12882959352.

The product of its digits is 38578680, while the sum is 65.

The spelling of 399371738951 in words is "three hundred ninety-nine billion, three hundred seventy-one million, seven hundred thirty-eight thousand, nine hundred fifty-one".