11996809 has 16 divisors (see below), whose sum is σ = 14016960. Its totient is φ = 10152000.

The previous prime is 11996791. The next prime is 11996821. The reversal of 11996809 is 90869911.

11996809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11996809 - 2⁷ = 11996681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11996009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12279 + ... + 13219.

It is an arithmetic number, because the mean of its divisors is an integer number (876060).

Almost surely, 2^11996809 is an apocalyptic number.

11996809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11996809 is a deficient number, since it is larger than the sum of its proper divisors (2020151).

11996809 is a wasteful number, since it uses less digits than its factorization.

11996809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 11996809 is about 3463.6410033374. The cubic root of 11996809 is about 228.9225534719.

It can be divided in two parts, 1199 and 6809, that added together give a palindrome (8008).

The spelling of 11996809 in words is "eleven million, nine hundred ninety-six thousand, eight hundred nine".