12787189 has 2 divisors, whose sum is σ = 12787190. Its totient is φ = 12787188.

The previous prime is 12787183. The next prime is 12787207. The reversal of 12787189 is 98178721.

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., 9394225 + 3392964 = 3065^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 12787189 - 2⁵ = 12787157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12787183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393594 + 6393595.

It is an arithmetic number, because the mean of its divisors is an integer number (6393595).

Almost surely, 2^12787189 is an apocalyptic number.

It is an amenable number.

12787189 is a deficient number, since it is larger than the sum of its proper divisors (1).

12787189 is an equidigital number, since it uses as much as digits as its factorization.

12787189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The square root of 12787189 is about 3575.9179241140. The cubic root of 12787189 is about 233.8433521915.

The spelling of 12787189 in words is "twelve million, seven hundred eighty-seven thousand, one hundred eighty-nine".