18430691 has 2 divisors, whose sum is σ = 18430692. Its totient is φ = 18430690.

The previous prime is 18430681. The next prime is 18430733. The reversal of 18430691 is 19603481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18430691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18430651) 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, 9215345 + 9215346.

It is an arithmetic number, because the mean of its divisors is an integer number (9215346).

Almost surely, 2^18430691 is an apocalyptic number.

18430691 is a deficient number, since it is larger than the sum of its proper divisors (1).

18430691 is an equidigital number, since it uses as much as digits as its factorization.

18430691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18430691 is about 4293.0980655000. The cubic root of 18430691 is about 264.1479265477.

The spelling of 18430691 in words is "eighteen million, four hundred thirty thousand, six hundred ninety-one".