11780987 has 4 divisors (see below), whose sum is σ = 11788920. Its totient is φ = 11773056.

The previous prime is 11780971. The next prime is 11781001. The reversal of 11780987 is 78908711.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78908711 = 7 ⋅11272673.

It is a cyclic number.

It is not a de Polignac number, because 11780987 - 2⁴ = 11780971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11780927) 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, 998 + ... + 4955.

It is an arithmetic number, because the mean of its divisors is an integer number (2947230).

Almost surely, 2^11780987 is an apocalyptic number.

11780987 is a deficient number, since it is larger than the sum of its proper divisors (7933).

11780987 is an equidigital number, since it uses as much as digits as its factorization.

11780987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7932.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 11780987 is about 3432.3442426423. The cubic root of 11780987 is about 227.5414697176.

The spelling of 11780987 in words is "eleven million, seven hundred eighty thousand, nine hundred eighty-seven".