18137472 has 64 divisors (see below), whose sum is σ = 48654000. Its totient is φ = 5986304.

The previous prime is 18137461. The next prime is 18137473. The reversal of 18137472 is 27473181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18137473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57058 + ... + 57374.

Almost surely, 2^18137472 is an apocalyptic number.

18137472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18137472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24327000).

18137472 is an abundant number, since it is smaller than the sum of its proper divisors (30516528).

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

18137472 is a wasteful number, since it uses less digits than its factorization.

18137472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 471 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 18137472 is about 4258.8111017043. The cubic root of 18137472 is about 262.7396306129.

The spelling of 18137472 in words is "eighteen million, one hundred thirty-seven thousand, four hundred seventy-two".