18537012 has 96 divisors (see below), whose sum is σ = 52716160. Its totient is φ = 5668704.

The previous prime is 18536929. The next prime is 18537019. The reversal of 18537012 is 21073581.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18537019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113643 + ... + 113805.

Almost surely, 2^18537012 is an apocalyptic number.

18537012 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 18537012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26358080).

18537012 is an abundant number, since it is smaller than the sum of its proper divisors (34179148).

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

18537012 is a wasteful number, since it uses less digits than its factorization.

18537012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18537012 is about 4305.4630413000. The cubic root of 18537012 is about 264.6548824099.

The spelling of 18537012 in words is "eighteen million, five hundred thirty-seven thousand, twelve".