187987 has 2 divisors, whose sum is σ = 187988. Its totient is φ = 187986.

The previous prime is 187973. The next prime is 188011. The reversal of 187987 is 789781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 187987 - 2¹⁵ = 155219 is a prime.

It is a super-2 number, since 2×187987² = 70678224338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (187907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93993 + 93994.

It is an arithmetic number, because the mean of its divisors is an integer number (93994).

2¹⁸⁷⁹⁸⁷ is an apocalyptic number.

187987 is a deficient number, since it is larger than the sum of its proper divisors (1).

187987 is an equidigital number, since it uses as much as digits as its factorization.

187987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 40.

The square root of 187987 is about 433.5746763823. The cubic root of 187987 is about 57.2852226949.

The spelling of 187987 in words is "one hundred eighty-seven thousand, nine hundred eighty-seven".