18111142 has 16 divisors (see below), whose sum is σ = 32682240. Its totient is φ = 7353288.

The previous prime is 18111139. The next prime is 18111157. The reversal of 18111142 is 24111181.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33778 + ... + 34309.

It is an arithmetic number, because the mean of its divisors is an integer number (2042640).

Almost surely, 2^18111142 is an apocalyptic number.

18111142 is a deficient number, since it is larger than the sum of its proper divisors (14571098).

18111142 is a wasteful number, since it uses less digits than its factorization.

18111142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68115.

The product of its digits is 64, while the sum is 19.

The square root of 18111142 is about 4255.7187407064. The cubic root of 18111142 is about 262.6124301456.

The spelling of 18111142 in words is "eighteen million, one hundred eleven thousand, one hundred forty-two".