43821668 has 48 divisors (see below), whose sum is σ = 88119360. Its totient is φ = 18883200.

The previous prime is 43821667. The next prime is 43821671. The reversal of 43821668 is 86612834.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (43821667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77555 + ... + 78117.

It is an arithmetic number, because the mean of its divisors is an integer number (1835820).

Almost surely, 2^43821668 is an apocalyptic number.

It is an amenable number.

43821668 is an abundant number, since it is smaller than the sum of its proper divisors (44297692).

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

43821668 is a wasteful number, since it uses less digits than its factorization.

43821668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 666 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 43821668 is about 6619.7936523732. The cubic root of 43821668 is about 352.5572376582.

The spelling of 43821668 in words is "forty-three million, eight hundred twenty-one thousand, six hundred sixty-eight".