18218659 has 2 divisors, whose sum is σ = 18218660. Its totient is φ = 18218658.

The previous prime is 18218653. The next prime is 18218693. The reversal of 18218659 is 95681281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18218659 - 2⁹ = 18218147 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18218653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109329 + 9109330.

It is an arithmetic number, because the mean of its divisors is an integer number (9109330).

Almost surely, 2^18218659 is an apocalyptic number.

18218659 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218659 is an equidigital number, since it uses as much as digits as its factorization.

18218659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 40.

The square root of 18218659 is about 4268.3321098527. The cubic root of 18218659 is about 263.1310724108.

The spelling of 18218659 in words is "eighteen million, two hundred eighteen thousand, six hundred fifty-nine".