18618994 has 8 divisors (see below), whose sum is σ = 28052208. Its totient is φ = 9268260.

The previous prime is 18618991. The next prime is 18619009. The reversal of 18618994 is 49981681.

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

It is not an unprimeable number, because it can be changed into a prime (18618991) by changing a digit.

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, 20052 + ... + 20959.

It is an arithmetic number, because the mean of its divisors is an integer number (3506526).

Almost surely, 2^18618994 is an apocalyptic number.

18618994 is a deficient number, since it is larger than the sum of its proper divisors (9433214).

18618994 is a wasteful number, since it uses less digits than its factorization.

18618994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41240.

The product of its digits is 124416, while the sum is 46.

The square root of 18618994 is about 4314.9732328254. The cubic root of 18618994 is about 265.0444638812.

The spelling of 18618994 in words is "eighteen million, six hundred eighteen thousand, nine hundred ninety-four".