11787817 has 4 divisors (see below), whose sum is σ = 12481236. Its totient is φ = 11094400.

The previous prime is 11787767. The next prime is 11787857. The reversal of 11787817 is 71878711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71878711 = 1901 ⋅37811.

It can be written as a sum of positive squares in 2 ways, for example, as 5517801 + 6270016 = 2349^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 11787817 - 2⁷ = 11787689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11787817.

It is not an unprimeable number, because it can be changed into a prime (11787857) 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, 346684 + ... + 346717.

It is an arithmetic number, because the mean of its divisors is an integer number (3120309).

Almost surely, 2^11787817 is an apocalyptic number.

11787817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11787817 is a deficient number, since it is larger than the sum of its proper divisors (693419).

11787817 is an equidigital number, since it uses as much as digits as its factorization.

11787817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693418.

The product of its digits is 21952, while the sum is 40.

The square root of 11787817 is about 3433.3390453027. The cubic root of 11787817 is about 227.5854334365.

The spelling of 11787817 in words is "eleven million, seven hundred eighty-seven thousand, eight hundred seventeen".