12878189 has 2 divisors, whose sum is σ = 12878190. Its totient is φ = 12878188.

The previous prime is 12878179. The next prime is 12878213. The reversal of 12878189 is 98187821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9815689 + 3062500 = 3133^2 + 1750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12878189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12878119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6439094 + 6439095.

It is an arithmetic number, because the mean of its divisors is an integer number (6439095).

Almost surely, 2^12878189 is an apocalyptic number.

It is an amenable number.

12878189 is a deficient number, since it is larger than the sum of its proper divisors (1).

12878189 is an equidigital number, since it uses as much as digits as its factorization.

12878189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 44.

The square root of 12878189 is about 3588.6193724049. The cubic root of 12878189 is about 234.3967567121.

The spelling of 12878189 in words is "twelve million, eight hundred seventy-eight thousand, one hundred eighty-nine".