18794491 has 2 divisors, whose sum is σ = 18794492. Its totient is φ = 18794490.

The previous prime is 18794467. The next prime is 18794539. The reversal of 18794491 is 19449781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18794491 - 2⁵ = 18794459 is a prime.

It is not a weakly prime, because it can be changed into another prime (18794411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9397245 + 9397246.

It is an arithmetic number, because the mean of its divisors is an integer number (9397246).

Almost surely, 2^18794491 is an apocalyptic number.

18794491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18794491 is an equidigital number, since it uses as much as digits as its factorization.

18794491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 18794491 is about 4335.2613531366. The cubic root of 18794491 is about 265.8746040576.

The spelling of 18794491 in words is "eighteen million, seven hundred ninety-four thousand, four hundred ninety-one".