18245557 has 8 divisors (see below), whose sum is σ = 20049120. Its totient is φ = 16466160.

The previous prime is 18245503. The next prime is 18245581. The reversal of 18245557 is 75554281.

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 18245557 - 2¹¹ = 18243509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18245597) 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, 4438 + ... + 7495.

It is an arithmetic number, because the mean of its divisors is an integer number (2506140).

Almost surely, 2^18245557 is an apocalyptic number.

It is an amenable number.

18245557 is a deficient number, since it is larger than the sum of its proper divisors (1803563).

18245557 is a wasteful number, since it uses less digits than its factorization.

18245557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12083.

The product of its digits is 56000, while the sum is 37.

The square root of 18245557 is about 4271.4818271883. The cubic root of 18245557 is about 263.2605041703.

It can be divided in two parts, 1824 and 5557, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 18245557 in words is "eighteen million, two hundred forty-five thousand, five hundred fifty-seven".