18994284 has 24 divisors (see below), whose sum is σ = 49244720. Its totient is φ = 6331392.

The previous prime is 18994277. The next prime is 18994303. The reversal of 18994284 is 48249981.

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 7 ways as a sum of consecutive naturals, for example, 87829 + ... + 88044.

Almost surely, 2^18994284 is an apocalyptic number.

It is an amenable number.

18994284 is an abundant number, since it is smaller than the sum of its proper divisors (30250436).

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

18994284 is a wasteful number, since it uses less digits than its factorization.

18994284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175886 (or 175878 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18994284 is about 4358.2432240526. The cubic root of 18994284 is about 266.8134032694.

The spelling of 18994284 in words is "eighteen million, nine hundred ninety-four thousand, two hundred eighty-four".