43421040 has 120 divisors (see below), whose sum is σ = 157073280. Its totient is φ = 10685952.

The previous prime is 43421039. The next prime is 43421047. The reversal of 43421040 is 4012434.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7041 + ... + 11679.

It is an arithmetic number, because the mean of its divisors is an integer number (1308944).

Almost surely, 2^43421040 is an apocalyptic number.

43421040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43421040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78536640).

43421040 is an abundant number, since it is smaller than the sum of its proper divisors (113652240).

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

43421040 is a wasteful number, since it uses less digits than its factorization.

43421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4671 (or 4662 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 43421040 is about 6589.4643181369. The cubic root of 43421040 is about 351.4795597529.

Adding to 43421040 its reverse (4012434), we get a palindrome (47433474).

The spelling of 43421040 in words is "forty-three million, four hundred twenty-one thousand, forty".