18390164 has 12 divisors (see below), whose sum is σ = 34658484. Its totient is φ = 8487744.

The previous prime is 18390131. The next prime is 18390167. The reversal of 18390164 is 46109381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6210064 + 12180100 = 2492^2 + 3490^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18390164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176777 + ... + 176880.

It is an arithmetic number, because the mean of its divisors is an integer number (2888207).

Almost surely, 2^18390164 is an apocalyptic number.

It is an amenable number.

18390164 is a deficient number, since it is larger than the sum of its proper divisors (16268320).

18390164 is a wasteful number, since it uses less digits than its factorization.

18390164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353674 (or 353672 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18390164 is about 4288.3754499810. The cubic root of 18390164 is about 263.9541740171.

The spelling of 18390164 in words is "eighteen million, three hundred ninety thousand, one hundred sixty-four".