12289644 has 60 divisors (see below), whose sum is σ = 32585784. Its totient is φ = 4038336.

The previous prime is 12289639. The next prime is 12289679. The reversal of 12289644 is 44698221.

12289644 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 9 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12289599 and 12289608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26664 + ... + 27120.

It is a vampire number, since it can be written as 1494 ⋅ 8226 (with its own digits).

Almost surely, 2^12289644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12289644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16292892).

12289644 is an abundant number, since it is smaller than the sum of its proper divisors (20296140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12289644 is a wasteful number, since it uses less digits than its factorization.

12289644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 545 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 12289644 is about 3505.6588539103. The cubic root of 12289644 is about 230.7702218419.

The spelling of 12289644 in words is "twelve million, two hundred eighty-nine thousand, six hundred forty-four".