319638139 has 4 divisors (see below), whose sum is σ = 320338024. Its totient is φ = 318938256.

The previous prime is 319638133. The next prime is 319638157. The reversal of 319638139 is 931836913.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-319638139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 319638095 and 319638104.

It is not an unprimeable number, because it can be changed into a prime (319638133) 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, 349257 + ... + 350170.

It is an arithmetic number, because the mean of its divisors is an integer number (80084506).

Almost surely, 2^319638139 is an apocalyptic number.

319638139 is a deficient number, since it is larger than the sum of its proper divisors (699885).

319638139 is an equidigital number, since it uses as much as digits as its factorization.

319638139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699884.

The product of its digits is 104976, while the sum is 43.

The square root of 319638139 is about 17878.4266365919. The cubic root of 319638139 is about 683.7324590906.

The spelling of 319638139 in words is "three hundred nineteen million, six hundred thirty-eight thousand, one hundred thirty-nine".