18161472 has 56 divisors (see below), whose sum is σ = 54920896. Its totient is φ = 5188608.

The previous prime is 18161459. The next prime is 18161501. The reversal of 18161472 is 27416181.

It is a tau number, because it is divible by the number of its divisors (56).

It is a nude number because it is divisible by every one of its digits.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5413 + ... + 8100.

Almost surely, 2^18161472 is an apocalyptic number.

18161472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18161472 is an abundant number, since it is smaller than the sum of its proper divisors (36759424).

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

18161472 is a wasteful number, since it uses less digits than its factorization.

18161472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535 (or 13525 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 18161472 is about 4261.6278579904. The cubic root of 18161472 is about 262.8554676282.

The spelling of 18161472 in words is "eighteen million, one hundred sixty-one thousand, four hundred seventy-two".