43239906 has 56 divisors (see below), whose sum is σ = 99471744. Its totient is φ = 14084280.

The previous prime is 43239887. The next prime is 43239943. The reversal of 43239906 is 60993234.

It is a happy number.

43239906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 68211 + ... + 68841.

Almost surely, 2^43239906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43239906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49735872).

43239906 is an abundant number, since it is smaller than the sum of its proper divisors (56231838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43239906 is an equidigital number, since it uses as much as digits as its factorization.

43239906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 43239906 is about 6575.7057415915. The cubic root of 43239906 is about 350.9901377900.

The spelling of 43239906 in words is "forty-three million, two hundred thirty-nine thousand, nine hundred six".