18994163 has 2 divisors, whose sum is σ = 18994164. Its totient is φ = 18994162.

The previous prime is 18994147. The next prime is 18994169. The reversal of 18994163 is 36149981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18994163 - 2⁴ = 18994147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18994163.

It is not a weakly prime, because it can be changed into another prime (18994169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497081 + 9497082.

It is an arithmetic number, because the mean of its divisors is an integer number (9497082).

Almost surely, 2^18994163 is an apocalyptic number.

18994163 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994163 is an equidigital number, since it uses as much as digits as its factorization.

18994163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 18994163 is about 4358.2293422903. The cubic root of 18994163 is about 266.8128367043.

The spelling of 18994163 in words is "eighteen million, nine hundred ninety-four thousand, one hundred sixty-three".