18168436 has 48 divisors (see below), whose sum is σ = 39005568. Its totient is φ = 7286400.

The previous prime is 18168433. The next prime is 18168439. The reversal of 18168436 is 63486181.

It is an interprime number because it is at equal distance from previous prime (18168433) and next prime (18168439).

It is a junction number, because it is equal to n+sod(n) for n = 18168395 and 18168404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168433) 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, 12466 + ... + 13846.

It is an arithmetic number, because the mean of its divisors is an integer number (812616).

Almost surely, 2^18168436 is an apocalyptic number.

It is an amenable number.

18168436 is an abundant number, since it is smaller than the sum of its proper divisors (20837132).

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

18168436 is a wasteful number, since it uses less digits than its factorization.

18168436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432 (or 1430 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 18168436 is about 4262.4448383527. Note that the first 3 decimals coincide. The cubic root of 18168436 is about 262.8890605652.

The spelling of 18168436 in words is "eighteen million, one hundred sixty-eight thousand, four hundred thirty-six".