18994463 has 2 divisors, whose sum is σ = 18994464. Its totient is φ = 18994462.

The previous prime is 18994453. The next prime is 18994477. The reversal of 18994463 is 36449981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18994463 - 2⁴ = 18994447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18994453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497231 + 9497232.

It is an arithmetic number, because the mean of its divisors is an integer number (9497232).

Almost surely, 2^18994463 is an apocalyptic number.

18994463 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994463 is an equidigital number, since it uses as much as digits as its factorization.

18994463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 18994463 is about 4358.2637598016. The cubic root of 18994463 is about 266.8142414066.

The spelling of 18994463 in words is "eighteen million, nine hundred ninety-four thousand, four hundred sixty-three".