18002164 has 6 divisors (see below), whose sum is σ = 31503794. Its totient is φ = 9001080.

The previous prime is 18002161. The next prime is 18002189. The reversal of 18002164 is 46120081.

It can be written as a sum of positive squares in only one way, i.e., 12194064 + 5808100 = 3492^2 + 2410^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18002161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2250267 + ... + 2250274.

Almost surely, 2^18002164 is an apocalyptic number.

It is an amenable number.

18002164 is a deficient number, since it is larger than the sum of its proper divisors (13501630).

18002164 is a wasteful number, since it uses less digits than its factorization.

18002164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500545 (or 4500543 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18002164 is about 4242.8957093004. The cubic root of 18002164 is about 262.0846413785.

The spelling of 18002164 in words is "eighteen million, two thousand, one hundred sixty-four".