43738561 has 4 divisors (see below), whose sum is σ = 44189572. Its totient is φ = 43287552.

The previous prime is 43738559. The next prime is 43738567. The reversal of 43738561 is 16583734.

43738561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6760000 + 36978561 = 2600^2 + 6081^2 .

It is a cyclic number.

It is not a de Polignac number, because 43738561 - 2¹ = 43738559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43738561.

It is not an unprimeable number, because it can be changed into a prime (43738567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225360 + ... + 225553.

It is an arithmetic number, because the mean of its divisors is an integer number (11047393).

Almost surely, 2^43738561 is an apocalyptic number.

It is an amenable number.

43738561 is a deficient number, since it is larger than the sum of its proper divisors (451011).

43738561 is an equidigital number, since it uses as much as digits as its factorization.

43738561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451010.

The product of its digits is 60480, while the sum is 37.

The square root of 43738561 is about 6613.5135140105. The cubic root of 43738561 is about 352.3342238120.

The spelling of 43738561 in words is "forty-three million, seven hundred thirty-eight thousand, five hundred sixty-one".