22143645 has 64 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 10948608.

The previous prime is 22143637. The next prime is 22143689. The reversal of 22143645 is 54634122.

22143645 is a `hidden beast` number, since 2 + 2 + 14 + 3 + 645 = 666.

It is not a de Polignac number, because 22143645 - 2³ = 22143637 is a prime.

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

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 228237 + ... + 228333.

It is an arithmetic number, because the mean of its divisors is an integer number (661500).

Almost surely, 2^22143645 is an apocalyptic number.

It is an amenable number.

22143645 is a deficient number, since it is larger than the sum of its proper divisors (20192355).

22143645 is a wasteful number, since it uses less digits than its factorization.

22143645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 22143645 is about 4705.7034543201. The cubic root of 22143645 is about 280.8124574428.

Adding to 22143645 its reverse (54634122), we get a palindrome (76777767).

The spelling of 22143645 in words is "twenty-two million, one hundred forty-three thousand, six hundred forty-five".