11999987 has 2 divisors, whose sum is σ = 11999988. Its totient is φ = 11999986.

The previous prime is 11999941. The next prime is 11999989. The reversal of 11999987 is 78999911.

It is a strong prime.

It is an emirp because it is prime and its reverse (78999911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11999987 - 2¹² = 11995891 is a prime.

Together with 11999989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11999989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5999993 + 5999994.

It is an arithmetic number, because the mean of its divisors is an integer number (5999994).

Almost surely, 2^11999987 is an apocalyptic number.

11999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11999987 is an equidigital number, since it uses as much as digits as its factorization.

11999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 53.

The square root of 11999987 is about 3464.0997387489. The cubic root of 11999987 is about 228.9427658368.

The spelling of 11999987 in words is "eleven million, nine hundred ninety-nine thousand, nine hundred eighty-seven".