43978145 has 4 divisors (see below), whose sum is σ = 52773780. Its totient is φ = 35182512.

The previous prime is 43978111. The next prime is 43978147. The reversal of 43978145 is 54187934.

43978145 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, and also an emirpimes, since its reverse is a distinct semiprime: 54187934 = 2 ⋅27093967.

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 24512401 = 4412^2 + 4951^2 .

It is a cyclic number.

It is not a de Polignac number, because 43978145 - 2¹⁴ = 43961761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43978147) 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, 4397810 + ... + 4397819.

It is an arithmetic number, because the mean of its divisors is an integer number (13193445).

Almost surely, 2^43978145 is an apocalyptic number.

It is an amenable number.

43978145 is a deficient number, since it is larger than the sum of its proper divisors (8795635).

43978145 is an equidigital number, since it uses as much as digits as its factorization.

43978145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8795634.

The product of its digits is 120960, while the sum is 41.

The square root of 43978145 is about 6631.6019934854. The cubic root of 43978145 is about 352.9763725167.

The spelling of 43978145 in words is "forty-three million, nine hundred seventy-eight thousand, one hundred forty-five".