18639814 has 8 divisors (see below), whose sum is σ = 27979200. Its totient is φ = 9313416.

The previous prime is 18639793. The next prime is 18639839. The reversal of 18639814 is 41893681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112 + ... + 6460.

It is an arithmetic number, because the mean of its divisors is an integer number (3497400).

Almost surely, 2^18639814 is an apocalyptic number.

18639814 is a deficient number, since it is larger than the sum of its proper divisors (9339386).

18639814 is a wasteful number, since it uses less digits than its factorization.

18639814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6494.

The product of its digits is 41472, while the sum is 40.

The square root of 18639814 is about 4317.3850882218. The cubic root of 18639814 is about 265.1432191302.

It can be divided in two parts, 186 and 39814, that added together give a square (40000 = 200²).

The spelling of 18639814 in words is "eighteen million, six hundred thirty-nine thousand, eight hundred fourteen".