11845809 has 12 divisors (see below), whose sum is σ = 17573556. Its totient is φ = 7683552.

The previous prime is 11845789. The next prime is 11845817. The reversal of 11845809 is 90854811.

It can be written as a sum of positive squares in 2 ways, for example, as 6426225 + 5419584 = 2535^2 + 2328^2 .

It is not a de Polignac number, because 11845809 - 2⁵ = 11845777 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (11845819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17454 + ... + 18119.

It is an arithmetic number, because the mean of its divisors is an integer number (1464463).

Almost surely, 2^11845809 is an apocalyptic number.

It is an amenable number.

11845809 is a deficient number, since it is larger than the sum of its proper divisors (5727747).

11845809 is a wasteful number, since it uses less digits than its factorization.

11845809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35616 (or 35613 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 11845809 is about 3441.7741064747. The cubic root of 11845809 is about 227.9580370603.

The spelling of 11845809 in words is "eleven million, eight hundred forty-five thousand, eight hundred nine".