18136557 has 12 divisors (see below), whose sum is σ = 26398944. Its totient is φ = 11997960.

The previous prime is 18136537. The next prime is 18136561. The reversal of 18136557 is 75563181.

It is not a de Polignac number, because 18136557 - 2⁶ = 18136493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18136537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6513 + ... + 8870.

It is an arithmetic number, because the mean of its divisors is an integer number (2199912).

Almost surely, 2^18136557 is an apocalyptic number.

It is an amenable number.

18136557 is a deficient number, since it is larger than the sum of its proper divisors (8262387).

18136557 is a wasteful number, since it uses less digits than its factorization.

18136557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15520 (or 15517 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 18136557 is about 4258.7036760028. The cubic root of 18136557 is about 262.7352123050.

The spelling of 18136557 in words is "eighteen million, one hundred thirty-six thousand, five hundred fifty-seven".