18000169 has 4 divisors (see below), whose sum is σ = 19636560. Its totient is φ = 16363780.

The previous prime is 18000149. The next prime is 18000209. The reversal of 18000169 is 96100081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18000169 - 2⁵ = 18000137 is a prime.

It is a super-2 number, since 2×18000169² = 648012168057122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18000139) 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, 818179 + ... + 818200.

It is an arithmetic number, because the mean of its divisors is an integer number (4909140).

Almost surely, 2^18000169 is an apocalyptic number.

It is an amenable number.

18000169 is a deficient number, since it is larger than the sum of its proper divisors (1636391).

18000169 is a wasteful number, since it uses less digits than its factorization.

18000169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636390.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18000169 is about 4242.6606039135. The cubic root of 18000169 is about 262.0749596133.

The spelling of 18000169 in words is "eighteen million, one hundred sixty-nine", and thus it is an aban number.