320821983 has 12 divisors (see below), whose sum is σ = 479389560. Its totient is φ = 206505936.

The previous prime is 320821961. The next prime is 320822017. The reversal of 320821983 is 389128023.

It is a happy number.

It is not a de Polignac number, because 320821983 - 2⁸ = 320821727 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320821903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614341 + ... + 614862.

It is an arithmetic number, because the mean of its divisors is an integer number (39949130).

Almost surely, 2^320821983 is an apocalyptic number.

320821983 is a deficient number, since it is larger than the sum of its proper divisors (158567577).

320821983 is a wasteful number, since it uses less digits than its factorization.

320821983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229238 (or 1229235 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 320821983 is about 17911.5042081898. The cubic root of 320821983 is about 684.5755325780.

The spelling of 320821983 in words is "three hundred twenty million, eight hundred twenty-one thousand, nine hundred eighty-three".