22643729 has 2 divisors, whose sum is σ = 22643730. Its totient is φ = 22643728.

The previous prime is 22643723. The next prime is 22643737. The reversal of 22643729 is 92734622.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 6225025 = 4052^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 22643729 - 2⁴ = 22643713 is a prime.

It is not a weakly prime, because it can be changed into another prime (22643723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11321864 + 11321865.

It is an arithmetic number, because the mean of its divisors is an integer number (11321865).

Almost surely, 2^22643729 is an apocalyptic number.

It is an amenable number.

22643729 is a deficient number, since it is larger than the sum of its proper divisors (1).

22643729 is an equidigital number, since it uses as much as digits as its factorization.

22643729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 22643729 is about 4758.5427391167. The cubic root of 22643729 is about 282.9106628240.

The spelling of 22643729 in words is "twenty-two million, six hundred forty-three thousand, seven hundred twenty-nine".