11987 has 2 divisors, whose sum is σ = 11988. Its totient is φ = 11986.

The previous prime is 11981. The next prime is 12007. The reversal of 11987 is 78911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11987 - 2⁴ = 11971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993 + 5994.

It is an arithmetic number, because the mean of its divisors is an integer number (5994).

2¹¹⁹⁸⁷ is an apocalyptic number.

11987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11987 is an equidigital number, since it uses as much as digits as its factorization.

11987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 26.

The square root of 11987 is about 109.4851588116. The cubic root of 11987 is about 22.8860144832.

The spelling of 11987 in words is "eleven thousand, nine hundred eighty-seven".