43309872 has 60 divisors (see below), whose sum is σ = 123043960. Its totient is φ = 14221152.

The previous prime is 43309867. The next prime is 43309879. The reversal of 43309872 is 27890334.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (43309879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646383 + ... + 646449.

Almost surely, 2^43309872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43309872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61521980).

43309872 is an abundant number, since it is smaller than the sum of its proper divisors (79734088).

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

43309872 is an frugal number, since it uses more digits than its factorization.

43309872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 43309872 is about 6581.0236285854. The cubic root of 43309872 is about 351.1793468240.

The spelling of 43309872 in words is "forty-three million, three hundred nine thousand, eight hundred seventy-two".