43440 has 40 divisors (see below), whose sum is σ = 135408. Its totient is φ = 11520.

The previous prime is 43427. The next prime is 43441. The reversal of 43440 is 4434.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (43441) by changing a digit.

43440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 150 + ... + 330.

2⁴³⁴⁴⁰ is an apocalyptic number.

43440 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 43440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67704).

43440 is an abundant number, since it is smaller than the sum of its proper divisors (91968).

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

43440 is a wasteful number, since it uses less digits than its factorization.

43440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 43440 is about 208.4226475218. The cubic root of 43440 is about 35.1530710706.

Adding to 43440 its reverse (4434), we get a palindrome (47874).

It can be divided in two parts, 434 and 40, that added together give a palindrome (474).

The spelling of 43440 in words is "forty-three thousand, four hundred forty", and thus it is an iban number.