18112387 has 2 divisors, whose sum is σ = 18112388. Its totient is φ = 18112386.

The previous prime is 18112349. The next prime is 18112399. The reversal of 18112387 is 78321181.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78321181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18112387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18112307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056193 + 9056194.

It is an arithmetic number, because the mean of its divisors is an integer number (9056194).

Almost surely, 2^18112387 is an apocalyptic number.

18112387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18112387 is an equidigital number, since it uses as much as digits as its factorization.

18112387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 31.

The square root of 18112387 is about 4255.8650119570. The cubic root of 18112387 is about 262.6184475277.

The spelling of 18112387 in words is "eighteen million, one hundred twelve thousand, three hundred eighty-seven".