18349867 has 2 divisors, whose sum is σ = 18349868. Its totient is φ = 18349866.

The previous prime is 18349853. The next prime is 18349873. The reversal of 18349867 is 76894381.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (76894381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18349867 - 2⁷ = 18349739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18349897) 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, 9174933 + 9174934.

It is an arithmetic number, because the mean of its divisors is an integer number (9174934).

Almost surely, 2^18349867 is an apocalyptic number.

18349867 is a deficient number, since it is larger than the sum of its proper divisors (1).

18349867 is an equidigital number, since it uses as much as digits as its factorization.

18349867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 18349867 is about 4283.6744740935. The cubic root of 18349867 is about 263.7612386367.

The spelling of 18349867 in words is "eighteen million, three hundred forty-nine thousand, eight hundred sixty-seven".