18423967 has 2 divisors, whose sum is σ = 18423968. Its totient is φ = 18423966.

The previous prime is 18423949. The next prime is 18424027. The reversal of 18423967 is 76932481.

It is a weak prime.

It is an emirp because it is prime and its reverse (76932481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18423967 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18423907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211983 + 9211984.

It is an arithmetic number, because the mean of its divisors is an integer number (9211984).

Almost surely, 2^18423967 is an apocalyptic number.

18423967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18423967 is an equidigital number, since it uses as much as digits as its factorization.

18423967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 18423967 is about 4292.3148766138. The cubic root of 18423967 is about 264.1157999408.

The spelling of 18423967 in words is "eighteen million, four hundred twenty-three thousand, nine hundred sixty-seven".