43720 has 16 divisors (see below), whose sum is σ = 98460. Its totient is φ = 17472.

The previous prime is 43717. The next prime is 43721. The reversal of 43720 is 2734.

It can be written as a sum of positive squares in 2 ways, for example, as 40804 + 2916 = 202^2 + 54^2 .

It is a super-2 number, since 2×43720² = 3822876800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43694 and 43703.

It is not an unprimeable number, because it can be changed into a prime (43721) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 507 + ... + 586.

2⁴³⁷²⁰ is an apocalyptic number.

43720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43720 is an abundant number, since it is smaller than the sum of its proper divisors (54740).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49230).

43720 is a wasteful number, since it uses less digits than its factorization.

43720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 43720 is about 209.0932806190. The cubic root of 43720 is about 35.2284377630.

The spelling of 43720 in words is "forty-three thousand, seven hundred twenty", and thus it is an iban number.