43239428 has 12 divisors (see below), whose sum is σ = 76363980. Its totient is φ = 21421152.

The previous prime is 43239407. The next prime is 43239439. The reversal of 43239428 is 82493234.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16386304 + 26853124 = 4048^2 + 5182^2 .

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, 49151 + ... + 50022.

It is an arithmetic number, because the mean of its divisors is an integer number (6363665).

Almost surely, 2^43239428 is an apocalyptic number.

It is an amenable number.

43239428 is a deficient number, since it is larger than the sum of its proper divisors (33124552).

43239428 is a wasteful number, since it uses less digits than its factorization.

43239428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99286 (or 99284 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 43239428 is about 6575.6693955825. The cubic root of 43239428 is about 350.9888444330.

The spelling of 43239428 in words is "forty-three million, two hundred thirty-nine thousand, four hundred twenty-eight".