43506 has 12 divisors (see below), whose sum is σ = 94302. Its totient is φ = 14496.

The previous prime is 43499. The next prime is 43517. The reversal of 43506 is 60534.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25281 + 18225 = 159^2 + 135^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2417 = 43506 / (4 + 3 + 5 + 0 + 6).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

43506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191 + ... + 1226.

2⁴³⁵⁰⁶ is an apocalyptic number.

43506 is an abundant number, since it is smaller than the sum of its proper divisors (50796).

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

43506 is a wasteful number, since it uses less digits than its factorization.

43506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425 (or 2422 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 43506 is about 208.5809195492. The cubic root of 43506 is about 35.1708651826.

It can be divided in two parts, 4350 and 6, that added together give a square (4356 = 66²).

The spelling of 43506 in words is "forty-three thousand, five hundred six".