18041987 has 2 divisors, whose sum is σ = 18041988. Its totient is φ = 18041986.

The previous prime is 18041971. The next prime is 18042029. The reversal of 18041987 is 78914081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18041987 - 2⁴ = 18041971 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18041987.

It is not a weakly prime, because it can be changed into another prime (18041957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020993 + 9020994.

It is an arithmetic number, because the mean of its divisors is an integer number (9020994).

Almost surely, 2^18041987 is an apocalyptic number.

18041987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18041987 is an equidigital number, since it uses as much as digits as its factorization.

18041987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18041987 is about 4247.5860203179. The cubic root of 18041987 is about 262.2777535352.

The spelling of 18041987 in words is "eighteen million, forty-one thousand, nine hundred eighty-seven".