18218867 has 2 divisors, whose sum is σ = 18218868. Its totient is φ = 18218866.

The previous prime is 18218857. The next prime is 18218881. The reversal of 18218867 is 76881281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18218867 - 2¹² = 18214771 is a prime.

It is a super-2 number, since 2×18218867² = 663854229527378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18218807) 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, 9109433 + 9109434.

It is an arithmetic number, because the mean of its divisors is an integer number (9109434).

Almost surely, 2^18218867 is an apocalyptic number.

18218867 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218867 is an equidigital number, since it uses as much as digits as its factorization.

18218867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 41.

The square root of 18218867 is about 4268.3564752724. The cubic root of 18218867 is about 263.1320737844.

The spelling of 18218867 in words is "eighteen million, two hundred eighteen thousand, eight hundred sixty-seven".