11856609 has 6 divisors (see below), whose sum is σ = 17126226. Its totient is φ = 7904400.

The previous prime is 11856583. The next prime is 11856629. The reversal of 11856609 is 90665811.

11856609 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 567009 = 3360^2 + 753^2 .

It is not a de Polignac number, because 11856609 - 2¹² = 11852513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11856629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658692 + ... + 658709.

It is an arithmetic number, because the mean of its divisors is an integer number (2854371).

Almost surely, 2^11856609 is an apocalyptic number.

It is an amenable number.

11856609 is a deficient number, since it is larger than the sum of its proper divisors (5269617).

11856609 is a wasteful number, since it uses less digits than its factorization.

11856609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317407 (or 1317404 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 11856609 is about 3443.3427073122. The cubic root of 11856609 is about 228.0272935932.

The spelling of 11856609 in words is "eleven million, eight hundred fifty-six thousand, six hundred nine".