18994047 has 16 divisors (see below), whose sum is σ = 25920000. Its totient is φ = 12368384.

The previous prime is 18994039. The next prime is 18994051. The reversal of 18994047 is 74049981.

It is a cyclic number.

It is not a de Polignac number, because 18994047 - 2³ = 18994039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42079 + ... + 42527.

It is an arithmetic number, because the mean of its divisors is an integer number (1620000).

Almost surely, 2^18994047 is an apocalyptic number.

18994047 is a deficient number, since it is larger than the sum of its proper divisors (6925953).

18994047 is a wasteful number, since it uses less digits than its factorization.

18994047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 18994047 is about 4358.2160341130. The cubic root of 18994047 is about 266.8122935488.

The spelling of 18994047 in words is "eighteen million, nine hundred ninety-four thousand, forty-seven".