12455909 has 4 divisors (see below), whose sum is σ = 12535404. Its totient is φ = 12376416.

The previous prime is 12455899. The next prime is 12455921. The reversal of 12455909 is 90955421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2356225 + 10099684 = 1535^2 + 3178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12455909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12455959) 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, 39512 + ... + 39825.

It is an arithmetic number, because the mean of its divisors is an integer number (3133851).

Almost surely, 2^12455909 is an apocalyptic number.

It is an amenable number.

12455909 is a deficient number, since it is larger than the sum of its proper divisors (79495).

12455909 is an equidigital number, since it uses as much as digits as its factorization.

12455909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79494.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 12455909 is about 3529.2929886877. The cubic root of 12455909 is about 231.8062504968.

The spelling of 12455909 in words is "twelve million, four hundred fifty-five thousand, nine hundred nine".