320918939 has 4 divisors (see below), whose sum is σ = 350093400. Its totient is φ = 291744480.

The previous prime is 320918921. The next prime is 320918947. The reversal of 320918939 is 939819023.

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 320918939 - 2¹² = 320914843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320918939.

It is not an unprimeable number, because it can be changed into a prime (320918909) 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, 14587214 + ... + 14587235.

It is an arithmetic number, because the mean of its divisors is an integer number (87523350).

Almost surely, 2^320918939 is an apocalyptic number.

320918939 is a deficient number, since it is larger than the sum of its proper divisors (29174461).

320918939 is a wasteful number, since it uses less digits than its factorization.

320918939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29174460.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 320918939 is about 17914.2105324237. The cubic root of 320918939 is about 684.6444877657.

The spelling of 320918939 in words is "three hundred twenty million, nine hundred eighteen thousand, nine hundred thirty-nine".