321312393 has 16 divisors (see below), whose sum is σ = 504020160. Its totient is φ = 201607488.

The previous prime is 321312389. The next prime is 321312487. The reversal of 321312393 is 393213123.

It is not a de Polignac number, because 321312393 - 2² = 321312389 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (321312293) 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, 349555 + ... + 350472.

It is an arithmetic number, because the mean of its divisors is an integer number (31501260).

Almost surely, 2^321312393 is an apocalyptic number.

It is an amenable number.

321312393 is a deficient number, since it is larger than the sum of its proper divisors (182707767).

321312393 is a wasteful number, since it uses less digits than its factorization.

321312393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700053 (or 700047 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 321312393 is about 17925.1887856167. The cubic root of 321312393 is about 684.9241701272.

The spelling of 321312393 in words is "three hundred twenty-one million, three hundred twelve thousand, three hundred ninety-three".