18447967 has 2 divisors, whose sum is σ = 18447968. Its totient is φ = 18447966.

The previous prime is 18447929. The next prime is 18447983. The reversal of 18447967 is 76974481.

It is a strong prime.

It is an emirp because it is prime and its reverse (76974481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18447967 - 2¹¹ = 18445919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18447997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223983 + 9223984.

It is an arithmetic number, because the mean of its divisors is an integer number (9223984).

Almost surely, 2^18447967 is an apocalyptic number.

18447967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18447967 is an equidigital number, since it uses as much as digits as its factorization.

18447967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 18447967 is about 4295.1096609982. The cubic root of 18447967 is about 264.2304337542.

The spelling of 18447967 in words is "eighteen million, four hundred forty-seven thousand, nine hundred sixty-seven".