320821897 has 16 divisors (see below), whose sum is σ = 369043200. Its totient is φ = 275829840.

The previous prime is 320821877. The next prime is 320821903. The reversal of 320821897 is 798128023.

It is a de Polignac number, because none of the positive numbers 2^k-320821897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320821817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178638 + ... + 180424.

It is an arithmetic number, because the mean of its divisors is an integer number (23065200).

Almost surely, 2^320821897 is an apocalyptic number.

It is an amenable number.

320821897 is a deficient number, since it is larger than the sum of its proper divisors (48221303).

320821897 is a wasteful number, since it uses less digits than its factorization.

320821897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 320821897 is about 17911.5018074979. The cubic root of 320821897 is about 684.5754714086.

The spelling of 320821897 in words is "three hundred twenty million, eight hundred twenty-one thousand, eight hundred ninety-seven".