320917939 has 4 divisors (see below), whose sum is σ = 321042456. Its totient is φ = 320793424.

The previous prime is 320917913. The next prime is 320917957. The reversal of 320917939 is 939719023.

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 320917939 - 2²⁵ = 287363507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320917895 and 320917904.

It is not an unprimeable number, because it can be changed into a prime (320914939) 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 3 ways as a sum of consecutive naturals, for example, 58309 + ... + 63574.

It is an arithmetic number, because the mean of its divisors is an integer number (80260614).

Almost surely, 2^320917939 is an apocalyptic number.

320917939 is a deficient number, since it is larger than the sum of its proper divisors (124517).

320917939 is a wasteful number, since it uses less digits than its factorization.

320917939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124516.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 320917939 is about 17914.1826215990. The cubic root of 320917939 is about 684.6437766358.

The spelling of 320917939 in words is "three hundred twenty million, nine hundred seventeen thousand, nine hundred thirty-nine".