12400217 has 16 divisors (see below), whose sum is σ = 13862400. Its totient is φ = 11041920.

The previous prime is 12400183. The next prime is 12400231. The reversal of 12400217 is 71200421.

It is a cyclic number.

It is not a de Polignac number, because 12400217 - 2¹⁰ = 12399193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12400195 and 12400204.

It is not an unprimeable number, because it can be changed into a prime (12400237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21509 + ... + 22077.

It is an arithmetic number, because the mean of its divisors is an integer number (866400).

Almost surely, 2^12400217 is an apocalyptic number.

It is an amenable number.

12400217 is a deficient number, since it is larger than the sum of its proper divisors (1462183).

12400217 is a wasteful number, since it uses less digits than its factorization.

12400217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 12400217 is about 3521.3941841265. The cubic root of 12400217 is about 231.4602556217.

Adding to 12400217 its reverse (71200421), we get a palindrome (83600638).

The spelling of 12400217 in words is "twelve million, four hundred thousand, two hundred seventeen".