18542818 has 24 divisors (see below), whose sum is σ = 33774912. Its totient is φ = 7477824.

The previous prime is 18542791. The next prime is 18542819. The reversal of 18542818 is 81824581.

It is a happy number.

It is a super-2 number, since 2×18542818² = 687672198762248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18542819) 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, 1755 + ... + 6337.

It is an arithmetic number, because the mean of its divisors is an integer number (1407288).

Almost surely, 2^18542818 is an apocalyptic number.

18542818 is a deficient number, since it is larger than the sum of its proper divisors (15232094).

18542818 is a wasteful number, since it uses less digits than its factorization.

18542818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 4609 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 18542818 is about 4306.1372481610. The cubic root of 18542818 is about 264.6825104845.

The spelling of 18542818 in words is "eighteen million, five hundred forty-two thousand, eight hundred eighteen".