43221864 has 32 divisors (see below), whose sum is σ = 123491520. Its totient is φ = 12349056.

The previous prime is 43221863. The next prime is 43221869. The reversal of 43221864 is 46812234.

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

It is not an unprimeable number, because it can be changed into a prime (43221863) 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 7 ways as a sum of consecutive naturals, for example, 128469 + ... + 128804.

It is an arithmetic number, because the mean of its divisors is an integer number (3859110).

Almost surely, 2^43221864 is an apocalyptic number.

It is an amenable number.

43221864 is an abundant number, since it is smaller than the sum of its proper divisors (80269656).

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

43221864 is a wasteful number, since it uses less digits than its factorization.

43221864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257289 (or 257285 counting only the distinct ones).

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

The square root of 43221864 is about 6574.3337305008. Note that the first 3 decimals coincide. The cubic root of 43221864 is about 350.9413137166.

The spelling of 43221864 in words is "forty-three million, two hundred twenty-one thousand, eight hundred sixty-four".