18164172 has 24 divisors (see below), whose sum is σ = 45643696. Its totient is φ = 5588928.

The previous prime is 18164161. The next prime is 18164173. The reversal of 18164172 is 27146181.

It is not an unprimeable number, because it can be changed into a prime (18164173) 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 in 7 ways as a sum of consecutive naturals, for example, 58063 + ... + 58374.

Almost surely, 2^18164172 is an apocalyptic number.

18164172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18164172 is an abundant number, since it is smaller than the sum of its proper divisors (27479524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18164172 is a wasteful number, since it uses less digits than its factorization.

18164172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116457 (or 116455 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 18164172 is about 4261.9446265760. The cubic root of 18164172 is about 262.8684929049.

Subtracting 18164172 from its reverse (27146181), we obtain a square (8982009 = 2997²).

It can be divided in two parts, 18164 and 172, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 18164172 in words is "eighteen million, one hundred sixty-four thousand, one hundred seventy-two".