12966889 has 4 divisors (see below), whose sum is σ = 13964356. Its totient is φ = 11969424.

The previous prime is 12966881. The next prime is 12966929. The reversal of 12966889 is 98866921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98866921 = 839 ⋅117839.

It can be written as a sum of positive squares in 2 ways, for example, as 1710864 + 11256025 = 1308^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 12966889 - 2³ = 12966881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12966881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498714 + ... + 498739.

It is an arithmetic number, because the mean of its divisors is an integer number (3491089).

Almost surely, 2^12966889 is an apocalyptic number.

It is an amenable number.

12966889 is a deficient number, since it is larger than the sum of its proper divisors (997467).

12966889 is an equidigital number, since it uses as much as digits as its factorization.

12966889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997466.

The product of its digits is 373248, while the sum is 49.

The square root of 12966889 is about 3600.9566784398. The cubic root of 12966889 is about 234.9336707324.

It can be divided in two parts, 1296 and 6889, that multiplied together give a square (8928144 = 2988²).

The spelling of 12966889 in words is "twelve million, nine hundred sixty-six thousand, eight hundred eighty-nine".