320821938 has 16 divisors (see below), whose sum is σ = 712937760. Its totient is φ = 106940628.

The previous prime is 320821937. The next prime is 320821961. The reversal of 320821938 is 839128023.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (320821937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2970520 + ... + 2970627.

It is an arithmetic number, because the mean of its divisors is an integer number (44558610).

Almost surely, 2^320821938 is an apocalyptic number.

320821938 is an abundant number, since it is smaller than the sum of its proper divisors (392115822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320821938 is a wasteful number, since it uses less digits than its factorization.

320821938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941158 (or 5941152 counting only the distinct ones).

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

The square root of 320821938 is about 17911.5029520138. The cubic root of 320821938 is about 684.5755005708.

The spelling of 320821938 in words is "three hundred twenty million, eight hundred twenty-one thousand, nine hundred thirty-eight".