11992209 has 4 divisors (see below), whose sum is σ = 15989616. Its totient is φ = 7994804.

The previous prime is 11992193. The next prime is 11992217. The reversal of 11992209 is 90229911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90229911 = 3 ⋅30076637.

It is a cyclic number.

It is not a de Polignac number, because 11992209 - 2⁴ = 11992193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11992209.

It is not an unprimeable number, because it can be changed into a prime (11992609) 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, 1998699 + ... + 1998704.

It is an arithmetic number, because the mean of its divisors is an integer number (3997404).

Almost surely, 2^11992209 is an apocalyptic number.

It is an amenable number.

11992209 is a deficient number, since it is larger than the sum of its proper divisors (3997407).

11992209 is an equidigital number, since it uses as much as digits as its factorization.

11992209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997406.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 11992209 is about 3462.9768985657. The cubic root of 11992209 is about 228.8932907359.

The spelling of 11992209 in words is "eleven million, nine hundred ninety-two thousand, two hundred nine".