12889787 has 2 divisors, whose sum is σ = 12889788. Its totient is φ = 12889786.

The previous prime is 12889783. The next prime is 12889819. The reversal of 12889787 is 78798821.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78798821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12889787 - 2² = 12889783 is a prime.

It is a super-2 number, since 2×12889787² = 332293217810738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12889783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6444893 + 6444894.

It is an arithmetic number, because the mean of its divisors is an integer number (6444894).

Almost surely, 2^12889787 is an apocalyptic number.

12889787 is a deficient number, since it is larger than the sum of its proper divisors (1).

12889787 is an equidigital number, since it uses as much as digits as its factorization.

12889787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 50.

The square root of 12889787 is about 3590.2349505290. The cubic root of 12889787 is about 234.4671009170.

The spelling of 12889787 in words is "twelve million, eight hundred eighty-nine thousand, seven hundred eighty-seven".