18008387 has 2 divisors, whose sum is σ = 18008388. Its totient is φ = 18008386.

The previous prime is 18008383. The next prime is 18008413. The reversal of 18008387 is 78380081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18008387 - 2² = 18008383 is a prime.

It is not a weakly prime, because it can be changed into another prime (18008383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004193 + 9004194.

It is an arithmetic number, because the mean of its divisors is an integer number (9004194).

Almost surely, 2^18008387 is an apocalyptic number.

18008387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008387 is an equidigital number, since it uses as much as digits as its factorization.

18008387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 18008387 is about 4243.6289894382. The cubic root of 18008387 is about 262.1148370970.

The spelling of 18008387 in words is "eighteen million, eight thousand, three hundred eighty-seven".