43523 has 4 divisors (see below), whose sum is σ = 44208. Its totient is φ = 42840.

The previous prime is 43517. The next prime is 43541. The reversal of 43523 is 32534.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32534 = 2 ⋅16267.

It is a cyclic number.

It is not a de Polignac number, because 43523 - 2¹⁰ = 42499 is a prime.

It is a d-powerful number, because it can be written as 4⁵ + 3⁹ + 5⁵ + 2³ + 3⁹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43543) 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, 236 + ... + 377.

It is an arithmetic number, because the mean of its divisors is an integer number (11052).

2⁴³⁵²³ is an apocalyptic number.

43523 is a deficient number, since it is larger than the sum of its proper divisors (685).

43523 is an equidigital number, since it uses as much as digits as its factorization.

43523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its digits is 360, while the sum is 17.

The square root of 43523 is about 208.6216671393. The cubic root of 43523 is about 35.1754455994.

The spelling of 43523 in words is "forty-three thousand, five hundred twenty-three".