18117072 has 30 divisors (see below), whose sum is σ = 50703042. Its totient is φ = 6038976.

The previous prime is 18117041. The next prime is 18117101. The reversal of 18117072 is 27071181.

It can be written as a sum of positive squares in only one way, i.e., 9960336 + 8156736 = 3156^2 + 2856^2 .

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, 62763 + ... + 63050.

Almost surely, 2^18117072 is an apocalyptic number.

18117072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18117072 is an abundant number, since it is smaller than the sum of its proper divisors (32585970).

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

18117072 is a wasteful number, since it uses less digits than its factorization.

18117072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125827 (or 125818 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 18117072 is about 4256.4153932623. The cubic root of 18117072 is about 262.6410887797.

The spelling of 18117072 in words is "eighteen million, one hundred seventeen thousand, seventy-two".