18986542 has 4 divisors (see below), whose sum is σ = 28479816. Its totient is φ = 9493270.

The previous prime is 18986533. The next prime is 18986573. The reversal of 18986542 is 24568981.

It is a happy number.

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

It is a super-3 number, since 3×18986542³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4746634 + ... + 4746637.

It is an arithmetic number, because the mean of its divisors is an integer number (7119954).

Almost surely, 2^18986542 is an apocalyptic number.

18986542 is a deficient number, since it is larger than the sum of its proper divisors (9493274).

18986542 is an equidigital number, since it uses as much as digits as its factorization.

18986542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493273.

The product of its digits is 138240, while the sum is 43.

The square root of 18986542 is about 4357.3549316070. The cubic root of 18986542 is about 266.7771476238. Note that the first 3 decimals are identical.

The spelling of 18986542 in words is "eighteen million, nine hundred eighty-six thousand, five hundred forty-two".