43564 has 6 divisors (see below), whose sum is σ = 76244. Its totient is φ = 21780.

The previous prime is 43543. The next prime is 43573. The reversal of 43564 is 46534.

It is an unprimeable 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 as a sum of consecutive naturals, namely, 5442 + ... + 5449.

2⁴³⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

43564 is a deficient number, since it is larger than the sum of its proper divisors (32680).

43564 is a wasteful number, since it uses less digits than its factorization.

43564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10895 (or 10893 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 43564 is about 208.7199080107. The cubic root of 43564 is about 35.1864875822.

Subtracting from 43564 its product of digits (1440), we obtain a palindrome (42124).

It can be divided in two parts, 4356 and 4, that multiplied together give a square (17424 = 132²).

The spelling of 43564 in words is "forty-three thousand, five hundred sixty-four".