18271116 has 24 divisors (see below), whose sum is σ = 47369840. Its totient is φ = 6090336.

The previous prime is 18271093. The next prime is 18271139. The reversal of 18271116 is 61117281.

It is an interprime number because it is at equal distance from previous prime (18271093) and next prime (18271139).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 18271116.

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, 84481 + ... + 84696.

Almost surely, 2^18271116 is an apocalyptic number.

It is an amenable number.

18271116 is an abundant number, since it is smaller than the sum of its proper divisors (29098724).

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

18271116 is a wasteful number, since it uses less digits than its factorization.

18271116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169190 (or 169182 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 18271116 is about 4274.4725990466. The cubic root of 18271116 is about 263.3833749191.

Adding to 18271116 its reverse (61117281), we get a palindrome (79388397).

The spelling of 18271116 in words is "eighteen million, two hundred seventy-one thousand, one hundred sixteen".