12400109 has 2 divisors, whose sum is σ = 12400110. Its totient is φ = 12400108.

The previous prime is 12400097. The next prime is 12400127. The reversal of 12400109 is 90100421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11764900 + 635209 = 3430^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400109 - 2²⁰ = 11351533 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200054 + 6200055.

It is an arithmetic number, because the mean of its divisors is an integer number (6200055).

Almost surely, 2^12400109 is an apocalyptic number.

It is an amenable number.

12400109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400109 is an equidigital number, since it uses as much as digits as its factorization.

12400109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12400109 is about 3521.3788492578. The cubic root of 12400109 is about 231.4595836501.

The spelling of 12400109 in words is "twelve million, four hundred thousand, one hundred nine".