11975987 has 4 divisors (see below), whose sum is σ = 12120360. Its totient is φ = 11831616.

The previous prime is 11975983. The next prime is 11975993. The reversal of 11975987 is 78957911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78957911 = 17 ⋅4644583.

It is a cyclic number.

It is not a de Polignac number, because 11975987 - 2² = 11975983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11975983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72062 + ... + 72227.

It is an arithmetic number, because the mean of its divisors is an integer number (3030090).

Almost surely, 2^11975987 is an apocalyptic number.

11975987 is a deficient number, since it is larger than the sum of its proper divisors (144373).

11975987 is an equidigital number, since it uses as much as digits as its factorization.

11975987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144372.

The product of its digits is 158760, while the sum is 47.

The square root of 11975987 is about 3460.6339014695. The cubic root of 11975987 is about 228.7900352952.

The spelling of 11975987 in words is "eleven million, nine hundred seventy-five thousand, nine hundred eighty-seven".