18874557 has 24 divisors (see below), whose sum is σ = 29508024. Its totient is φ = 11556864.

The previous prime is 18874529. The next prime is 18874591. The reversal of 18874557 is 75547881.

It is a happy number.

18874557 is a `hidden beast` number, since 18 + 87 + 4 + 557 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2277081 + 16597476 = 1509^2 + 4074^2 .

It is not a de Polignac number, because 18874557 - 2¹¹ = 18872509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18874057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41073 + ... + 41529.

It is an arithmetic number, because the mean of its divisors is an integer number (1229501).

Almost surely, 2^18874557 is an apocalyptic number.

It is an amenable number.

18874557 is a deficient number, since it is larger than the sum of its proper divisors (10633467).

18874557 is a wasteful number, since it uses less digits than its factorization.

18874557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 826 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 18874557 is about 4344.4858153756. The cubic root of 18874557 is about 266.2516180554.

The spelling of 18874557 in words is "eighteen million, eight hundred seventy-four thousand, five hundred fifty-seven".