18112155 has 32 divisors (see below), whose sum is σ = 30910464. Its totient is φ = 9035136.

The previous prime is 18112147. The next prime is 18112169. The reversal of 18112155 is 55121181.

It is not a de Polignac number, because 18112155 - 2³ = 18112147 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 15657 + ... + 16773.

It is an arithmetic number, because the mean of its divisors is an integer number (965952).

Almost surely, 2^18112155 is an apocalyptic number.

18112155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18112155 is a deficient number, since it is larger than the sum of its proper divisors (12798309).

18112155 is a wasteful number, since it uses less digits than its factorization.

18112155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195.

The product of its digits is 400, while the sum is 24.

The square root of 18112155 is about 4255.8377553662. The cubic root of 18112155 is about 262.6173262372.

The spelling of 18112155 in words is "eighteen million, one hundred twelve thousand, one hundred fifty-five".