18808967 has 2 divisors, whose sum is σ = 18808968. Its totient is φ = 18808966.

The previous prime is 18808957. The next prime is 18808973. The reversal of 18808967 is 76980881.

It is a strong prime.

It is an emirp because it is prime and its reverse (76980881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18808967 - 2¹² = 18804871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18808957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404483 + 9404484.

It is an arithmetic number, because the mean of its divisors is an integer number (9404484).

Almost surely, 2^18808967 is an apocalyptic number.

18808967 is a deficient number, since it is larger than the sum of its proper divisors (1).

18808967 is an equidigital number, since it uses as much as digits as its factorization.

18808967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18808967 is about 4336.9305966317. The cubic root of 18808967 is about 265.9428476907.

The spelling of 18808967 in words is "eighteen million, eight hundred eight thousand, nine hundred sixty-seven".