43740 has 48 divisors (see below), whose sum is σ = 137760. Its totient is φ = 11664.

The previous prime is 43721. The next prime is 43753. The reversal of 43740 is 4734.

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

It is a nialpdrome in base 9.

It is a zygodrome in base 9.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 45 × 27 × 36.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8746 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (2870).

2⁴³⁷⁴⁰ 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 43740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68880).

43740 is an abundant number, since it is smaller than the sum of its proper divisors (94020).

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

43740 is an equidigital number, since it uses as much as digits as its factorization.

43740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 43740 is about 209.1411006952. The cubic root of 43740 is about 35.2338087705.

The spelling of 43740 in words is "forty-three thousand, seven hundred forty", and thus it is an iban number.