10668209 has 4 divisors (see below), whose sum is σ = 10827504. Its totient is φ = 10508916.

The previous prime is 10668193. The next prime is 10668223. The reversal of 10668209 is 90286601.

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.

It is a cyclic number.

It is not a de Polignac number, because 10668209 - 2⁴ = 10668193 is a prime.

It is a super-2 number, since 2×10668209² = 227621366535362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10668269) 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, 79547 + ... + 79680.

It is an arithmetic number, because the mean of its divisors is an integer number (2706876).

Almost surely, 2^10668209 is an apocalyptic number.

It is an amenable number.

10668209 is a deficient number, since it is larger than the sum of its proper divisors (159295).

10668209 is an equidigital number, since it uses as much as digits as its factorization.

10668209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159294.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 10668209 is about 3266.2224357811. Note that the first 3 decimals coincide. The cubic root of 10668209 is about 220.1390924826.

The spelling of 10668209 in words is "ten million, six hundred sixty-eight thousand, two hundred nine".