43989545 has 4 divisors (see below), whose sum is σ = 52787460. Its totient is φ = 35191632.

The previous prime is 43989521. The next prime is 43989551. The reversal of 43989545 is 54598934.

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 12931216 + 31058329 = 3596^2 + 5573^2 .

It is a cyclic number.

It is not a de Polignac number, because 43989545 - 2⁶ = 43989481 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43989545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4398950 + ... + 4398959.

It is an arithmetic number, because the mean of its divisors is an integer number (13196865).

Almost surely, 2^43989545 is an apocalyptic number.

It is an amenable number.

43989545 is a deficient number, since it is larger than the sum of its proper divisors (8797915).

43989545 is an equidigital number, since it uses as much as digits as its factorization.

43989545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8797914.

The product of its digits is 777600, while the sum is 47.

The square root of 43989545 is about 6632.4614586140. The cubic root of 43989545 is about 353.0068693541.

The spelling of 43989545 in words is "forty-three million, nine hundred eighty-nine thousand, five hundred forty-five".