43938820 has 12 divisors (see below), whose sum is σ = 92271564. Its totient is φ = 17575520.

The previous prime is 43938803. The next prime is 43938821. The reversal of 43938820 is 2883934.

It can be written as a sum of positive squares in 2 ways, for example, as 31449664 + 12489156 = 5608^2 + 3534^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43938820.

It is not an unprimeable number, because it can be changed into a prime (43938821) 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 3 ways as a sum of consecutive naturals, for example, 1098451 + ... + 1098490.

It is an arithmetic number, because the mean of its divisors is an integer number (7689297).

Almost surely, 2^43938820 is an apocalyptic number.

It is an amenable number.

43938820 is an abundant number, since it is smaller than the sum of its proper divisors (48332744).

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

43938820 is a wasteful number, since it uses less digits than its factorization.

43938820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196950 (or 2196948 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 43938820 is about 6628.6363605194. The cubic root of 43938820 is about 352.8711313393.

The spelling of 43938820 in words is "forty-three million, nine hundred thirty-eight thousand, eight hundred twenty".