18112557 has 8 divisors (see below), whose sum is σ = 24257376. Its totient is φ = 12021392.

The previous prime is 18112553. The next prime is 18112583. The reversal of 18112557 is 75521181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18112557 - 2² = 18112553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12618 + ... + 13979.

It is an arithmetic number, because the mean of its divisors is an integer number (3032172).

Almost surely, 2^18112557 is an apocalyptic number.

It is an amenable number.

18112557 is a deficient number, since it is larger than the sum of its proper divisors (6144819).

18112557 is a wasteful number, since it uses less digits than its factorization.

18112557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26827.

The product of its digits is 2800, while the sum is 30.

The square root of 18112557 is about 4255.8849843481. The cubic root of 18112557 is about 262.6192691568.

It can be divided in two parts, 18 and 112557, that added together give a triangular number (112575 = T₄₇₄).

The spelling of 18112557 in words is "eighteen million, one hundred twelve thousand, five hundred fifty-seven".