11787665 has 4 divisors (see below), whose sum is σ = 14145204. Its totient is φ = 9430128.

The previous prime is 11787653. The next prime is 11787667. The reversal of 11787665 is 56678711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3625216 + 8162449 = 1904^2 + 2857^2 .

It is a cyclic number.

It is not a de Polignac number, because 11787665 - 2⁴ = 11787649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11787667) 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, 1178762 + ... + 1178771.

It is an arithmetic number, because the mean of its divisors is an integer number (3536301).

Almost surely, 2^11787665 is an apocalyptic number.

It is an amenable number.

11787665 is a deficient number, since it is larger than the sum of its proper divisors (2357539).

11787665 is an equidigital number, since it uses as much as digits as its factorization.

11787665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357538.

The product of its digits is 70560, while the sum is 41.

The square root of 11787665 is about 3433.3169093458. The cubic root of 11787665 is about 227.5844552194.

The spelling of 11787665 in words is "eleven million, seven hundred eighty-seven thousand, six hundred sixty-five".