18168612 has 108 divisors (see below), whose sum is σ = 54832176. Its totient is φ = 4630080.

The previous prime is 18168611. The next prime is 18168659. The reversal of 18168612 is 21686181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18168611) 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 35 ways as a sum of consecutive naturals, for example, 342778 + ... + 342830.

Almost surely, 2^18168612 is an apocalyptic number.

18168612 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 18168612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27416088).

18168612 is an abundant number, since it is smaller than the sum of its proper divisors (36663564).

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

18168612 is a wasteful number, since it uses less digits than its factorization.

18168612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 76 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 18168612 is about 4262.4654837312. The cubic root of 18168612 is about 262.8899094426.

Multiplying 18168612 by its sum of digits (33), we get a square (599564196 = 24486²).

18168612 divided by its sum of digits (33) gives a square (550564 = 742²).

The spelling of 18168612 in words is "eighteen million, one hundred sixty-eight thousand, six hundred twelve".