11809842 has 24 divisors (see below), whose sum is σ = 25963728. Its totient is φ = 3578520.

The previous prime is 11809841. The next prime is 11809859. The reversal of 11809842 is 24890811.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (11809841) 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, 7408 + ... + 8859.

It is an arithmetic number, because the mean of its divisors is an integer number (1081822).

Almost surely, 2^11809842 is an apocalyptic number.

11809842 is an abundant number, since it is smaller than the sum of its proper divisors (14153886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11809842 is a wasteful number, since it uses less digits than its factorization.

11809842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16294 (or 16283 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 11809842 is about 3436.5450673605. The cubic root of 11809842 is about 227.7270895913.

The spelling of 11809842 in words is "eleven million, eight hundred nine thousand, eight hundred forty-two".