321994189 has 8 divisors (see below), whose sum is σ = 354170880. Its totient is φ = 292720780.

The previous prime is 321994157. The next prime is 321994199. The reversal of 321994189 is 981499123.

It is a happy number.

It is not a de Polignac number, because 321994189 - 2⁵ = 321994157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321994109) 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, 119629 + ... + 122290.

It is an arithmetic number, because the mean of its divisors is an integer number (44271360).

Almost surely, 2^321994189 is an apocalyptic number.

It is an amenable number.

321994189 is a deficient number, since it is larger than the sum of its proper divisors (32176691).

321994189 is an equidigital number, since it uses as much as digits as its factorization.

321994189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241952 (or 241930 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 321994189 is about 17944.1965270112. The cubic root of 321994189 is about 685.4082770410.

The spelling of 321994189 in words is "three hundred twenty-one million, nine hundred ninety-four thousand, one hundred eighty-nine".