22543643 has 8 divisors (see below), whose sum is σ = 23508480. Its totient is φ = 21591360.

The previous prime is 22543637. The next prime is 22543663. The reversal of 22543643 is 34634522.

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

It is a cyclic number.

It is not a de Polignac number, because 22543643 - 2⁴ = 22543627 is a prime.

It is a super-2 number, since 2×22543643² = 1016431679422898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22543663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623 + ... + 6743.

It is an arithmetic number, because the mean of its divisors is an integer number (2938560).

Almost surely, 2^22543643 is an apocalyptic number.

22543643 is a deficient number, since it is larger than the sum of its proper divisors (964837).

22543643 is a wasteful number, since it uses less digits than its factorization.

22543643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6277.

The product of its digits is 17280, while the sum is 29.

The square root of 22543643 is about 4748.0146377196. The cubic root of 22543643 is about 282.4932224860.

The spelling of 22543643 in words is "twenty-two million, five hundred forty-three thousand, six hundred forty-three".