18168540 has 48 divisors (see below), whose sum is σ = 54787488. Its totient is φ = 4472064.

The previous prime is 18168539. The next prime is 18168569. The reversal of 18168540 is 4586181.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10867 + ... + 12426.

It is an arithmetic number, because the mean of its divisors is an integer number (1141406).

Almost surely, 2^18168540 is an apocalyptic number.

18168540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18168540 is an abundant number, since it is smaller than the sum of its proper divisors (36618948).

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

18168540 is a wasteful number, since it uses less digits than its factorization.

18168540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23318 (or 23316 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 18168540 is about 4262.4570379067. The cubic root of 18168540 is about 262.8895621752.

The spelling of 18168540 in words is "eighteen million, one hundred sixty-eight thousand, five hundred forty".