43421428 has 12 divisors (see below), whose sum is σ = 76248900. Its totient is φ = 21636032.

The previous prime is 43421393. The next prime is 43421429. The reversal of 43421428 is 82412434.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25120144 + 18301284 = 5012^2 + 4278^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43421396 and 43421405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17353 + ... + 19696.

It is an arithmetic number, because the mean of its divisors is an integer number (6354075).

Almost surely, 2^43421428 is an apocalyptic number.

It is an amenable number.

43421428 is a deficient number, since it is larger than the sum of its proper divisors (32827472).

43421428 is a wasteful number, since it uses less digits than its factorization.

43421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37346 (or 37344 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

The square root of 43421428 is about 6589.4937590076. The cubic root of 43421428 is about 351.4806066621.

The spelling of 43421428 in words is "forty-three million, four hundred twenty-one thousand, four hundred twenty-eight".