18328987 has 2 divisors, whose sum is σ = 18328988. Its totient is φ = 18328986.

The previous prime is 18328979. The next prime is 18328991. The reversal of 18328987 is 78982381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18328987 - 2³ = 18328979 is a prime.

It is not a weakly prime, because it can be changed into another prime (18328997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164493 + 9164494.

It is an arithmetic number, because the mean of its divisors is an integer number (9164494).

Almost surely, 2^18328987 is an apocalyptic number.

18328987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328987 is an equidigital number, since it uses as much as digits as its factorization.

18328987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 18328987 is about 4281.2366204170. The cubic root of 18328987 is about 263.6611575320.

The spelling of 18328987 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred eighty-seven".