12643722 has 128 divisors (see below), whose sum is σ = 36126720. Its totient is φ = 3188160.

The previous prime is 12643717. The next prime is 12643723. The reversal of 12643722 is 22734621.

12643722 is a `hidden beast` number, since 12 + 643 + 7 + 2 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12643723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152293 + ... + 152375.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

Almost surely, 2^12643722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12643722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18063360).

12643722 is an abundant number, since it is smaller than the sum of its proper divisors (23482998).

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

12643722 is a wasteful number, since it uses less digits than its factorization.

12643722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 139 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 12643722 is about 3555.8011755440. The cubic root of 12643722 is about 232.9655189140.

The spelling of 12643722 in words is "twelve million, six hundred forty-three thousand, seven hundred twenty-two".