18136725 has 12 divisors (see below), whose sum is σ = 29986176. Its totient is φ = 9672880.

The previous prime is 18136721. The next prime is 18136733. The reversal of 18136725 is 52763181.

It is not a de Polignac number, because 18136725 - 2² = 18136721 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 120837 + ... + 120986.

It is an arithmetic number, because the mean of its divisors is an integer number (2498848).

Almost surely, 2^18136725 is an apocalyptic number.

18136725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18136725 is a deficient number, since it is larger than the sum of its proper divisors (11849451).

18136725 is a wasteful number, since it uses less digits than its factorization.

18136725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241836 (or 241831 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 18136725 is about 4258.7234002691. The cubic root of 18136725 is about 262.7360235465.

The spelling of 18136725 in words is "eighteen million, one hundred thirty-six thousand, seven hundred twenty-five".