18322987 has 2 divisors, whose sum is σ = 18322988. Its totient is φ = 18322986.

The previous prime is 18322961. The next prime is 18323003. The reversal of 18322987 is 78922381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18322987 - 2¹⁵ = 18290219 is a prime.

It is not a weakly prime, because it can be changed into another prime (18322937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9161493 + 9161494.

It is an arithmetic number, because the mean of its divisors is an integer number (9161494).

Almost surely, 2^18322987 is an apocalyptic number.

18322987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18322987 is an equidigital number, since it uses as much as digits as its factorization.

18322987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 18322987 is about 4280.5358309445. The cubic root of 18322987 is about 263.6323845362.

The spelling of 18322987 in words is "eighteen million, three hundred twenty-two thousand, nine hundred eighty-seven".