18689994 has 16 divisors (see below), whose sum is σ = 41533440. Its totient is φ = 6229980.

The previous prime is 18689989. The next prime is 18690019. The reversal of 18689994 is 49998681.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 346111 = 18689994 / (1 + 8 + 6 + 8 + 9 + 9 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 18689994.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173002 + ... + 173109.

It is an arithmetic number, because the mean of its divisors is an integer number (2595840).

Almost surely, 2^18689994 is an apocalyptic number.

18689994 is an abundant number, since it is smaller than the sum of its proper divisors (22843446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18689994 is a wasteful number, since it uses less digits than its factorization.

18689994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346122 (or 346116 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 18689994 is about 4323.1925703119. The cubic root of 18689994 is about 265.3809354732.

It can be divided in two parts, 18689 and 994, that added together give a 9-th power (19683 = 3⁹).

The spelling of 18689994 in words is "eighteen million, six hundred eighty-nine thousand, nine hundred ninety-four".