12278887 has 2 divisors, whose sum is σ = 12278888. Its totient is φ = 12278886.

The previous prime is 12278869. The next prime is 12278909. The reversal of 12278887 is 78887221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12278887 - 2¹⁵ = 12246119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12278837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6139443 + 6139444.

It is an arithmetic number, because the mean of its divisors is an integer number (6139444).

Almost surely, 2^12278887 is an apocalyptic number.

12278887 is a deficient number, since it is larger than the sum of its proper divisors (1).

12278887 is an equidigital number, since it uses as much as digits as its factorization.

12278887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 43.

The square root of 12278887 is about 3504.1242843255. The cubic root of 12278887 is about 230.7028719143.

The spelling of 12278887 in words is "twelve million, two hundred seventy-eight thousand, eight hundred eighty-seven".