22143864 has 32 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 7311456.

The previous prime is 22143859. The next prime is 22143881. The reversal of 22143864 is 46834122.

It is a nude number because it is divisible by every one of its digits.

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 7 ways as a sum of consecutive naturals, for example, 1744 + ... + 6879.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^22143864 is an apocalyptic number.

22143864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22143864 is an abundant number, since it is smaller than the sum of its proper divisors (33739656).

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

22143864 is a wasteful number, since it uses less digits than its factorization.

22143864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8739 (or 8735 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 22143864 is about 4705.7267238972. The cubic root of 22143864 is about 280.8133831821.

Adding to 22143864 its reverse (46834122), we get a palindrome (68977986).

The spelling of 22143864 in words is "twenty-two million, one hundred forty-three thousand, eight hundred sixty-four".