319920439 has 2 divisors, whose sum is σ = 319920440. Its totient is φ = 319920438.

The previous prime is 319920427. The next prime is 319920443. The reversal of 319920439 is 934029913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 319920439 - 2⁹ = 319919927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319920449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159960219 + 159960220.

It is an arithmetic number, because the mean of its divisors is an integer number (159960220).

Almost surely, 2^319920439 is an apocalyptic number.

319920439 is a deficient number, since it is larger than the sum of its proper divisors (1).

319920439 is an equidigital number, since it uses as much as digits as its factorization.

319920439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 319920439 is about 17886.3198842020. The cubic root of 319920439 is about 683.9336875570.

The spelling of 319920439 in words is "three hundred nineteen million, nine hundred twenty thousand, four hundred thirty-nine".