12455217 has 6 divisors (see below), whose sum is σ = 17990882. Its totient is φ = 8303472.

The previous prime is 12455189. The next prime is 12455221. The reversal of 12455217 is 71255421.

12455217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7750656 + 4704561 = 2784^2 + 2169^2 .

It is not a de Polignac number, because 12455217 - 2⁸ = 12454961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12455227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691948 + ... + 691965.

Almost surely, 2^12455217 is an apocalyptic number.

It is an amenable number.

12455217 is a deficient number, since it is larger than the sum of its proper divisors (5535665).

12455217 is a wasteful number, since it uses less digits than its factorization.

12455217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383919 (or 1383916 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 12455217 is about 3529.1949506934. The cubic root of 12455217 is about 231.8019576776.

The spelling of 12455217 in words is "twelve million, four hundred fifty-five thousand, two hundred seventeen".