18468557 has 4 divisors (see below), whose sum is σ = 18651516. Its totient is φ = 18285600.

The previous prime is 18468547. The next prime is 18468577. The reversal of 18468557 is 75586481.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16491721 + 1976836 = 4061^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 18468557 - 2¹² = 18464461 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 (18468547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91328 + ... + 91529.

It is an arithmetic number, because the mean of its divisors is an integer number (4662879).

Almost surely, 2^18468557 is an apocalyptic number.

It is an amenable number.

18468557 is a deficient number, since it is larger than the sum of its proper divisors (182959).

18468557 is a wasteful number, since it uses less digits than its factorization.

18468557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182958.

The product of its digits is 268800, while the sum is 44.

The square root of 18468557 is about 4297.5059045916. The cubic root of 18468557 is about 264.3287008028.

The spelling of 18468557 in words is "eighteen million, four hundred sixty-eight thousand, five hundred fifty-seven".