43239945 has 16 divisors (see below), whose sum is σ = 79067520. Its totient is φ = 19766784.

The previous prime is 43239943. The next prime is 43239961. The reversal of 43239945 is 54993234.

It is not a de Polignac number, because 43239945 - 2¹ = 43239943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43239943) 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 15 ways as a sum of consecutive naturals, for example, 205800 + ... + 206009.

It is an arithmetic number, because the mean of its divisors is an integer number (4941720).

Almost surely, 2^43239945 is an apocalyptic number.

It is an amenable number.

43239945 is a deficient number, since it is larger than the sum of its proper divisors (35827575).

43239945 is a wasteful number, since it uses less digits than its factorization.

43239945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411824.

The product of its digits is 116640, while the sum is 39.

The square root of 43239945 is about 6575.7087070520. The cubic root of 43239945 is about 350.9902433145.

The spelling of 43239945 in words is "forty-three million, two hundred thirty-nine thousand, nine hundred forty-five".