18131612 has 12 divisors (see below), whose sum is σ = 32824680. Its totient is φ = 8753136.

The previous prime is 18131609. The next prime is 18131623. The reversal of 18131612 is 21613181.

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 3 ways as a sum of consecutive naturals, for example, 78038 + ... + 78269.

It is an arithmetic number, because the mean of its divisors is an integer number (2735390).

Almost surely, 2^18131612 is an apocalyptic number.

It is an amenable number.

18131612 is a deficient number, since it is larger than the sum of its proper divisors (14693068).

18131612 is a wasteful number, since it uses less digits than its factorization.

18131612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156340 (or 156338 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 18131612 is about 4258.1230606924. The cubic root of 18131612 is about 262.7113315556.

Adding to 18131612 its reverse (21613181), we get a palindrome (39744793).

The spelling of 18131612 in words is "eighteen million, one hundred thirty-one thousand, six hundred twelve".