43428 has 48 divisors (see below), whose sum is σ = 129024. Its totient is φ = 11040.

The previous prime is 43427. The next prime is 43441. The reversal of 43428 is 82434.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (43427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901 + ... + 947.

It is an arithmetic number, because the mean of its divisors is an integer number (2688).

2⁴³⁴²⁸ 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 43428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64512).

43428 is an abundant number, since it is smaller than the sum of its proper divisors (85596).

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

43428 is a wasteful number, since it uses less digits than its factorization.

43428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 70 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 43428 is about 208.3938578749. The cubic root of 43428 is about 35.1498338414.

The spelling of 43428 in words is "forty-three thousand, four hundred twenty-eight".