18168416 has 36 divisors (see below), whose sum is σ = 41612508. Its totient is φ = 7785792.

The previous prime is 18168373. The next prime is 18168433. The reversal of 18168416 is 61486181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4226 + ... + 7361.

It is an arithmetic number, because the mean of its divisors is an integer number (1155903).

Almost surely, 2^18168416 is an apocalyptic number.

18168416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18168416 is an abundant number, since it is smaller than the sum of its proper divisors (23444092).

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

18168416 is a wasteful number, since it uses less digits than its factorization.

18168416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11611 (or 11596 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18168416 is about 4262.4424922807. The cubic root of 18168416 is about 262.8889641015. Note that the first 3 decimals are identical.

The spelling of 18168416 in words is "eighteen million, one hundred sixty-eight thousand, four hundred sixteen".