43223640 has 32 divisors (see below), whose sum is σ = 129671280. Its totient is φ = 11526272.

The previous prime is 43223633. The next prime is 43223669. The reversal of 43223640 is 4632234.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 43223640.

It is a congruent number.

It is an unprimeable number.

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, 179979 + ... + 180218.

Almost surely, 2^43223640 is an apocalyptic number.

43223640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43223640 is an abundant number, since it is smaller than the sum of its proper divisors (86447640).

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

43223640 is a wasteful number, since it uses less digits than its factorization.

43223640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360211 (or 360207 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 43223640 is about 6574.4687998347. The cubic root of 43223640 is about 350.9461204138.

Adding to 43223640 its reverse (4632234), we get a palindrome (47855874).

The spelling of 43223640 in words is "forty-three million, two hundred twenty-three thousand, six hundred forty".