18965818 has 8 divisors (see below), whose sum is σ = 28489248. Its totient is φ = 9469404.

The previous prime is 18965803. The next prime is 18965827. The reversal of 18965818 is 81856981.

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

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4896 + ... + 7867.

It is an arithmetic number, because the mean of its divisors is an integer number (3561156).

Almost surely, 2^18965818 is an apocalyptic number.

18965818 is a deficient number, since it is larger than the sum of its proper divisors (9523430).

18965818 is a wasteful number, since it uses less digits than its factorization.

18965818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13508.

The product of its digits is 138240, while the sum is 46.

The square root of 18965818 is about 4354.9762341487. The cubic root of 18965818 is about 266.6800489812.

The spelling of 18965818 in words is "eighteen million, nine hundred sixty-five thousand, eight hundred eighteen".