18012724 has 12 divisors (see below), whose sum is σ = 33376644. Its totient is φ = 8476544.

The previous prime is 18012721. The next prime is 18012737. The reversal of 18012724 is 42721081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9120400 + 8892324 = 3020^2 + 2982^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012721) 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 3 ways as a sum of consecutive naturals, for example, 132379 + ... + 132514.

It is an arithmetic number, because the mean of its divisors is an integer number (2781387).

Almost surely, 2^18012724 is an apocalyptic number.

It is an amenable number.

18012724 is a deficient number, since it is larger than the sum of its proper divisors (15363920).

18012724 is a wasteful number, since it uses less digits than its factorization.

18012724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264914 (or 264912 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18012724 is about 4244.1399599919. The cubic root of 18012724 is about 262.1358773083.

The spelling of 18012724 in words is "eighteen million, twelve thousand, seven hundred twenty-four".