18867967 has 2 divisors, whose sum is σ = 18867968. Its totient is φ = 18867966.

The previous prime is 18867923. The next prime is 18867973. The reversal of 18867967 is 76976881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18867967 - 2⁷ = 18867839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18867917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433983 + 9433984.

It is an arithmetic number, because the mean of its divisors is an integer number (9433984).

Almost surely, 2^18867967 is an apocalyptic number.

18867967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18867967 is an equidigital number, since it uses as much as digits as its factorization.

18867967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 18867967 is about 4343.7273164875. The cubic root of 18867967 is about 266.2206274400.

The spelling of 18867967 in words is "eighteen million, eight hundred sixty-seven thousand, nine hundred sixty-seven".