11777987 has 4 divisors (see below), whose sum is σ = 12684000. Its totient is φ = 10871976.

The previous prime is 11777971. The next prime is 11778007. The reversal of 11777987 is 78977711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78977711 = 1063 ⋅74297.

It is a cyclic number.

It is not a de Polignac number, because 11777987 - 2⁴ = 11777971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11777287) 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, 452987 + ... + 453012.

It is an arithmetic number, because the mean of its divisors is an integer number (3171000).

Almost surely, 2^11777987 is an apocalyptic number.

11777987 is a deficient number, since it is larger than the sum of its proper divisors (906013).

11777987 is an equidigital number, since it uses as much as digits as its factorization.

11777987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906012.

The product of its digits is 172872, while the sum is 47.

The square root of 11777987 is about 3431.9071957149. The cubic root of 11777987 is about 227.5221537819.

The spelling of 11777987 in words is "eleven million, seven hundred seventy-seven thousand, nine hundred eighty-seven".