12205906 has 4 divisors (see below), whose sum is σ = 18308862. Its totient is φ = 6102952.

The previous prime is 12205903. The next prime is 12205933. The reversal of 12205906 is 60950221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 1083681 = 3335^2 + 1041^2 .

It is not an unprimeable number, because it can be changed into a prime (12205901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3051475 + ... + 3051478.

Almost surely, 2^12205906 is an apocalyptic number.

12205906 is a deficient number, since it is larger than the sum of its proper divisors (6102956).

12205906 is an equidigital number, since it uses as much as digits as its factorization.

12205906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102955.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12205906 is about 3493.6951784608. The cubic root of 12205906 is about 230.2448935353.

The spelling of 12205906 in words is "twelve million, two hundred five thousand, nine hundred six".