12239217 has 6 divisors (see below), whose sum is σ = 17678882. Its totient is φ = 8159472.

The previous prime is 12239177. The next prime is 12239221. The reversal of 12239217 is 71293221.

12239217 is digitally balanced in base 2 and base 4, because in such bases 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., 6305121 + 5934096 = 2511^2 + 2436^2 .

It is not a de Polignac number, because 12239217 - 2⁶ = 12239153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12239417) 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, 679948 + ... + 679965.

Almost surely, 2^12239217 is an apocalyptic number.

It is an amenable number.

12239217 is a deficient number, since it is larger than the sum of its proper divisors (5439665).

12239217 is a wasteful number, since it uses less digits than its factorization.

12239217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359919 (or 1359916 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 12239217 is about 3498.4592322907. The cubic root of 12239217 is about 230.4541561967.

It can be divided in two parts, 1223 and 9217, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 12239217 in words is "twelve million, two hundred thirty-nine thousand, two hundred seventeen".