319721938 has 16 divisors (see below), whose sum is σ = 483088320. Its totient is φ = 158696496.

The previous prime is 319721933. The next prime is 319721939. The reversal of 319721938 is 839127913.

It is a junction number, because it is equal to n+sod(n) for n = 319721894 and 319721903.

It is not an unprimeable number, because it can be changed into a prime (319721933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347443 + ... + 348361.

It is an arithmetic number, because the mean of its divisors is an integer number (30193020).

Almost surely, 2^319721938 is an apocalyptic number.

319721938 is a deficient number, since it is larger than the sum of its proper divisors (163366382).

319721938 is a wasteful number, since it uses less digits than its factorization.

319721938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001.

The product of its digits is 81648, while the sum is 43.

The square root of 319721938 is about 17880.7700617171. The cubic root of 319721938 is about 683.7922048708.

The spelling of 319721938 in words is "three hundred nineteen million, seven hundred twenty-one thousand, nine hundred thirty-eight".