320785919 has 4 divisors (see below), whose sum is σ = 321738144. Its totient is φ = 319833696.

The previous prime is 320785909. The next prime is 320785921. The reversal of 320785919 is 919587023.

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 320785919 - 2²⁴ = 304008703 is a prime.

It is a super-2 number, since 2×320785919² = 205807211657349122, which contains 22 as substring.

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 320785919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320785909) 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, 475607 + ... + 476280.

It is an arithmetic number, because the mean of its divisors is an integer number (80434536).

Almost surely, 2^320785919 is an apocalyptic number.

320785919 is a deficient number, since it is larger than the sum of its proper divisors (952225).

320785919 is an equidigital number, since it uses as much as digits as its factorization.

320785919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952224.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 320785919 is about 17910.4974526114. The cubic root of 320785919 is about 684.5498802865.

The spelling of 320785919 in words is "three hundred twenty million, seven hundred eighty-five thousand, nine hundred nineteen".