320990 has 8 divisors (see below), whose sum is σ = 577800. Its totient is φ = 128392.

The previous prime is 320953. The next prime is 321007. The reversal of 320990 is 99023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320990.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16040 + ... + 16059.

It is an arithmetic number, because the mean of its divisors is an integer number (72225).

2³²⁰⁹⁹⁰ is an apocalyptic number.

320990 is a deficient number, since it is larger than the sum of its proper divisors (256810).

320990 is a wasteful number, since it uses less digits than its factorization.

320990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32106.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 320990 is about 566.5597938435. The cubic root of 320990 is about 68.4695017589.

The spelling of 320990 in words is "three hundred twenty thousand, nine hundred ninety".