43821812 has 6 divisors (see below), whose sum is σ = 76688178. Its totient is φ = 21910904.

The previous prime is 43821803. The next prime is 43821829. The reversal of 43821812 is 21812834.

It can be written as a sum of positive squares in only one way, i.e., 42042256 + 1779556 = 6484^2 + 1334^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5477723 + ... + 5477730.

It is an arithmetic number, because the mean of its divisors is an integer number (12781363).

Almost surely, 2^43821812 is an apocalyptic number.

It is an amenable number.

43821812 is a deficient number, since it is larger than the sum of its proper divisors (32866366).

43821812 is a wasteful number, since it uses less digits than its factorization.

43821812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10955457 (or 10955455 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 43821812 is about 6619.8045288362. The cubic root of 43821812 is about 352.5576238308.

The spelling of 43821812 in words is "forty-three million, eight hundred twenty-one thousand, eight hundred twelve".