18388272 has 40 divisors (see below), whose sum is σ = 54290176. Its totient is φ = 5253696.

The previous prime is 18388261. The next prime is 18388273. The reversal of 18388272 is 27288381.

18388272 = T₂₈₈ + T₂₈₉ + ... + T₅₁₁.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 18388272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27028 + ... + 27699.

Almost surely, 2^18388272 is an apocalyptic number.

18388272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18388272 is an abundant number, since it is smaller than the sum of its proper divisors (35901904).

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

18388272 is a wasteful number, since it uses less digits than its factorization.

18388272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54745 (or 54739 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 18388272 is about 4288.1548479503. The cubic root of 18388272 is about 263.9451217428.

It can be divided in two parts, 18 and 388272, that multiplied together give a palindrome (6988896).

The spelling of 18388272 in words is "eighteen million, three hundred eighty-eight thousand, two hundred seventy-two".