43928609 has 2 divisors, whose sum is σ = 43928610. Its totient is φ = 43928608.

The previous prime is 43928557. The next prime is 43928683. The reversal of 43928609 is 90682934.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28302400 + 15626209 = 5320^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 43928609 - 2²⁴ = 27151393 is a prime.

It is not a weakly prime, because it can be changed into another prime (43921609) 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 as a sum of consecutive naturals, namely, 21964304 + 21964305.

It is an arithmetic number, because the mean of its divisors is an integer number (21964305).

Almost surely, 2^43928609 is an apocalyptic number.

It is an amenable number.

43928609 is a deficient number, since it is larger than the sum of its proper divisors (1).

43928609 is an equidigital number, since it uses as much as digits as its factorization.

43928609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 43928609 is about 6627.8660970180. The cubic root of 43928609 is about 352.8437944933.

The spelling of 43928609 in words is "forty-three million, nine hundred twenty-eight thousand, six hundred nine".