18012538 has 12 divisors (see below), whose sum is σ = 27985230. Its totient is φ = 8694896.

The previous prime is 18012499. The next prime is 18012541. The reversal of 18012538 is 83521081.

It can be written as a sum of positive squares in 3 ways, for example, as 17918289 + 94249 = 4233^2 + 307^2 .

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 5 ways as a sum of consecutive naturals, for example, 3673 + ... + 7036.

Almost surely, 2^18012538 is an apocalyptic number.

18012538 is a deficient number, since it is larger than the sum of its proper divisors (9972692).

18012538 is a wasteful number, since it uses less digits than its factorization.

18012538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10769 (or 10740 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18012538 is about 4244.1180473686. The cubic root of 18012538 is about 262.1349750305.

The spelling of 18012538 in words is "eighteen million, twelve thousand, five hundred thirty-eight".