12956689 has 4 divisors (see below), whose sum is σ = 13638640. Its totient is φ = 12274740.

The previous prime is 12956687. The next prime is 12956701. The reversal of 12956689 is 98665921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98665921 = 211 ⋅467611.

It is a cyclic number.

It is not a de Polignac number, because 12956689 - 2¹ = 12956687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12956681) 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, 340947 + ... + 340984.

It is an arithmetic number, because the mean of its divisors is an integer number (3409660).

Almost surely, 2^12956689 is an apocalyptic number.

12956689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12956689 is a deficient number, since it is larger than the sum of its proper divisors (681951).

12956689 is an equidigital number, since it uses as much as digits as its factorization.

12956689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681950.

The product of its digits is 233280, while the sum is 46.

The square root of 12956689 is about 3599.5401095140. The cubic root of 12956689 is about 234.8720534844.

The spelling of 12956689 in words is "twelve million, nine hundred fifty-six thousand, six hundred eighty-nine".