18739718 has 4 divisors (see below), whose sum is σ = 28109580. Its totient is φ = 9369858.

The previous prime is 18739697. The next prime is 18739727. The reversal of 18739718 is 81793781.

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

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, 4684928 + ... + 4684931.

It is an arithmetic number, because the mean of its divisors is an integer number (7027395).

Almost surely, 2^18739718 is an apocalyptic number.

18739718 is a deficient number, since it is larger than the sum of its proper divisors (9369862).

18739718 is an equidigital number, since it uses as much as digits as its factorization.

18739718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9369861.

The product of its digits is 84672, while the sum is 44.

The square root of 18739718 is about 4328.9395930181. The cubic root of 18739718 is about 265.6160722813.

The spelling of 18739718 in words is "eighteen million, seven hundred thirty-nine thousand, seven hundred eighteen".