18042887 has 2 divisors, whose sum is σ = 18042888. Its totient is φ = 18042886.

The previous prime is 18042859. The next prime is 18042917. The reversal of 18042887 is 78824081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18042887 - 2¹² = 18038791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18042887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18042487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021443 + 9021444.

It is an arithmetic number, because the mean of its divisors is an integer number (9021444).

Almost surely, 2^18042887 is an apocalyptic number.

18042887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18042887 is an equidigital number, since it uses as much as digits as its factorization.

18042887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 18042887 is about 4247.6919615245. The cubic root of 18042887 is about 262.2821145858.

The spelling of 18042887 in words is "eighteen million, forty-two thousand, eight hundred eighty-seven".