321643894 has 48 divisors (see below), whose sum is σ = 601277040. Its totient is φ = 127828800.

The previous prime is 321643877. The next prime is 321643897. The reversal of 321643894 is 498346123.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321643897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57084 + ... + 62464.

It is an arithmetic number, because the mean of its divisors is an integer number (12526605).

Almost surely, 2^321643894 is an apocalyptic number.

321643894 is a deficient number, since it is larger than the sum of its proper divisors (279633146).

321643894 is a wasteful number, since it uses less digits than its factorization.

321643894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5437 (or 5426 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The square root of 321643894 is about 17934.4331942774. The cubic root of 321643894 is about 685.1596367248.

The spelling of 321643894 in words is "three hundred twenty-one million, six hundred forty-three thousand, eight hundred ninety-four".