321960865 has 16 divisors (see below), whose sum is σ = 397398528. Its totient is φ = 250226496.

The previous prime is 321960851. The next prime is 321960883. The reversal of 321960865 is 568069123.

It is a cyclic number.

It is not a de Polignac number, because 321960865 - 2¹¹ = 321958817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225544 + ... + 226966.

It is an arithmetic number, because the mean of its divisors is an integer number (24837408).

Almost surely, 2^321960865 is an apocalyptic number.

It is an amenable number.

321960865 is a deficient number, since it is larger than the sum of its proper divisors (75437663).

321960865 is a wasteful number, since it uses less digits than its factorization.

321960865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 321960865 is about 17943.2679576492. The cubic root of 321960865 is about 685.3846313416.

The spelling of 321960865 in words is "three hundred twenty-one million, nine hundred sixty thousand, eight hundred sixty-five".