18994308 has 24 divisors (see below), whose sum is σ = 44929248. Its totient is φ = 6244416.

The previous prime is 18994307. The next prime is 18994309. The reversal of 18994308 is 80349981.

It is an interprime number because it is at equal distance from previous prime (18994307) and next prime (18994309).

It is a self number, because there is not a number n which added to its sum of digits gives 18994308.

It is not an unprimeable number, because it can be changed into a prime (18994303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9966 + ... + 11717.

It is an arithmetic number, because the mean of its divisors is an integer number (1872052).

Almost surely, 2^18994308 is an apocalyptic number.

It is an amenable number.

18994308 is an abundant number, since it is smaller than the sum of its proper divisors (25934940).

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

18994308 is a wasteful number, since it uses less digits than its factorization.

18994308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21763 (or 21761 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18994308 is about 4358.2459774547. The cubic root of 18994308 is about 266.8135156456.

The spelling of 18994308 in words is "eighteen million, nine hundred ninety-four thousand, three hundred eight".