12766389 has 8 divisors (see below), whose sum is σ = 17571072. Its totient is φ = 8236320.

The previous prime is 12766373. The next prime is 12766393. The reversal of 12766389 is 98366721.

12766389 = 1187² + 1188² + ... + 1195².

It is a happy number.

12766389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12766389 - 2⁴ = 12766373 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12766389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12766319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68544 + ... + 68729.

It is an arithmetic number, because the mean of its divisors is an integer number (2196384).

Almost surely, 2^12766389 is an apocalyptic number.

It is an amenable number.

12766389 is a deficient number, since it is larger than the sum of its proper divisors (4804683).

12766389 is a wasteful number, since it uses less digits than its factorization.

12766389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137307.

The product of its digits is 108864, while the sum is 42.

The square root of 12766389 is about 3573.0083962958. The cubic root of 12766389 is about 233.7164913313.

The spelling of 12766389 in words is "twelve million, seven hundred sixty-six thousand, three hundred eighty-nine".