18289172 has 48 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 7768800.

The previous prime is 18289171. The next prime is 18289177. The reversal of 18289172 is 27198281.

It is a super-4 number, since 4×18289172⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109433 + ... + 109599.

It is an arithmetic number, because the mean of its divisors is an integer number (776160).

Almost surely, 2^18289172 is an apocalyptic number.

It is an amenable number.

18289172 is an abundant number, since it is smaller than the sum of its proper divisors (18966508).

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

18289172 is a wasteful number, since it uses less digits than its factorization.

18289172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 330 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 18289172 is about 4276.5841509317. The cubic root of 18289172 is about 263.4701071603.

The spelling of 18289172 in words is "eighteen million, two hundred eighty-nine thousand, one hundred seventy-two".