18842387 has 2 divisors, whose sum is σ = 18842388. Its totient is φ = 18842386.

The previous prime is 18842377. The next prime is 18842393. The reversal of 18842387 is 78324881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18842387 - 2⁶ = 18842323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18842377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421193 + 9421194.

It is an arithmetic number, because the mean of its divisors is an integer number (9421194).

Almost surely, 2^18842387 is an apocalyptic number.

18842387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18842387 is an equidigital number, since it uses as much as digits as its factorization.

18842387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 41.

The square root of 18842387 is about 4340.7818420188. The cubic root of 18842387 is about 266.1002646499.

The spelling of 18842387 in words is "eighteen million, eight hundred forty-two thousand, three hundred eighty-seven".