18986774 has 4 divisors (see below), whose sum is σ = 28480164. Its totient is φ = 9493386.

The previous prime is 18986771. The next prime is 18986791. The reversal of 18986774 is 47768981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47768981 = 13 ⋅3674537.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18986771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4746692 + ... + 4746695.

It is an arithmetic number, because the mean of its divisors is an integer number (7120041).

Almost surely, 2^18986774 is an apocalyptic number.

18986774 is a deficient number, since it is larger than the sum of its proper divisors (9493390).

18986774 is an equidigital number, since it uses as much as digits as its factorization.

18986774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493389.

The product of its digits is 677376, while the sum is 50.

The square root of 18986774 is about 4357.3815531808. The cubic root of 18986774 is about 266.7782342188.

The spelling of 18986774 in words is "eighteen million, nine hundred eighty-six thousand, seven hundred seventy-four".