43439928 has 128 divisors (see below), whose sum is σ = 135168000. Its totient is φ = 11352960.

The previous prime is 43439927. The next prime is 43439983. The reversal of 43439928 is 82993434.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 43439928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43439927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98733 + ... + 99171.

It is an arithmetic number, because the mean of its divisors is an integer number (1056000).

Almost surely, 2^43439928 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 43439928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67584000).

43439928 is an abundant number, since it is smaller than the sum of its proper divisors (91728072).

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

43439928 is a wasteful number, since it uses less digits than its factorization.

43439928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 501 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 43439928 is about 6590.8973592372. The cubic root of 43439928 is about 351.5305164899.

The spelling of 43439928 in words is "forty-three million, four hundred thirty-nine thousand, nine hundred twenty-eight".