18112731 has 16 divisors (see below), whose sum is σ = 29723904. Its totient is φ = 9553824.

The previous prime is 18112727. The next prime is 18112741. The reversal of 18112731 is 13721181.

It is a happy number.

It is not a de Polignac number, because 18112731 - 2² = 18112727 is a prime.

It is a super-2 number, since 2×18112731² = 656142048556722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18112741) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 32901 + ... + 33446.

It is an arithmetic number, because the mean of its divisors is an integer number (1857744).

Almost surely, 2^18112731 is an apocalyptic number.

18112731 is a deficient number, since it is larger than the sum of its proper divisors (11611173).

18112731 is a wasteful number, since it uses less digits than its factorization.

18112731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66370.

The product of its digits is 336, while the sum is 24.

The square root of 18112731 is about 4255.9054265808. The cubic root of 18112731 is about 262.6201101131.

The spelling of 18112731 in words is "eighteen million, one hundred twelve thousand, seven hundred thirty-one".