18814491 has 8 divisors (see below), whose sum is σ = 27873360. Its totient is φ = 12542976.

The previous prime is 18814487. The next prime is 18814501. The reversal of 18814491 is 19441881.

It is not a de Polignac number, because 18814491 - 2² = 18814487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18814891) 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 in 7 ways as a sum of consecutive naturals, for example, 348390 + ... + 348443.

It is an arithmetic number, because the mean of its divisors is an integer number (3484170).

Almost surely, 2^18814491 is an apocalyptic number.

18814491 is a deficient number, since it is larger than the sum of its proper divisors (9058869).

18814491 is an equidigital number, since it uses as much as digits as its factorization.

18814491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696842 (or 696836 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 18814491 is about 4337.5674058163. The cubic root of 18814491 is about 265.9688800347.

The spelling of 18814491 in words is "eighteen million, eight hundred fourteen thousand, four hundred ninety-one".