18557982 has 24 divisors (see below), whose sum is σ = 42574896. Its totient is φ = 5822016.

The previous prime is 18557977. The next prime is 18557989. The reversal of 18557982 is 28975581.

It is a happy number.

18557982 is a `hidden beast` number, since 1 + 8 + 557 + 98 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30018 + ... + 30629.

It is an arithmetic number, because the mean of its divisors is an integer number (1773954).

Almost surely, 2^18557982 is an apocalyptic number.

18557982 is an abundant number, since it is smaller than the sum of its proper divisors (24016914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18557982 is a wasteful number, since it uses less digits than its factorization.

18557982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60672 (or 60669 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 18557982 is about 4307.8976310957. The cubic root of 18557982 is about 264.7546417717.

The spelling of 18557982 in words is "eighteen million, five hundred fifty-seven thousand, nine hundred eighty-two".