43421440 has 36 divisors (see below), whose sum is σ = 104010984. Its totient is φ = 17368064.

The previous prime is 43421437. The next prime is 43421449. The reversal of 43421440 is 4412434.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421449) 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, 15682 + ... + 18241.

It is an arithmetic number, because the mean of its divisors is an integer number (2889194).

Almost surely, 2^43421440 is an apocalyptic number.

43421440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43421440 is an abundant number, since it is smaller than the sum of its proper divisors (60589544).

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

43421440 is an equidigital number, since it uses as much as digits as its factorization.

43421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33944 (or 33930 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 43421440 is about 6589.4946695479. The cubic root of 43421440 is about 351.4806390407.

Adding to 43421440 its reverse (4412434), we get a palindrome (47833874).

The spelling of 43421440 in words is "forty-three million, four hundred twenty-one thousand, four hundred forty".