18490557 has 8 divisors (see below), whose sum is σ = 24805984. Its totient is φ = 12251088.

The previous prime is 18490517. The next prime is 18490573. The reversal of 18490557 is 75509481.

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

It is not a de Polignac number, because 18490557 - 2¹⁴ = 18474173 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 (18490517) 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, 18418 + ... + 19395.

It is an arithmetic number, because the mean of its divisors is an integer number (3100748).

Almost surely, 2^18490557 is an apocalyptic number.

It is an amenable number.

18490557 is a deficient number, since it is larger than the sum of its proper divisors (6315427).

18490557 is a wasteful number, since it uses less digits than its factorization.

18490557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37979.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 18490557 is about 4300.0647669541. The cubic root of 18490557 is about 264.4336164871.

The spelling of 18490557 in words is "eighteen million, four hundred ninety thousand, five hundred fifty-seven".