43641 has 12 divisors (see below), whose sum is σ = 68068. Its totient is φ = 26784.

The previous prime is 43633. The next prime is 43649. The reversal of 43641 is 14634.

It is an interprime number because it is at equal distance from previous prime (43633) and next prime (43649).

It can be written as a sum of positive squares in 2 ways, for example, as 14400 + 29241 = 120^2 + 171^2 .

It is not a de Polignac number, because 43641 - 2³ = 43633 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (43649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70 + ... + 303.

2⁴³⁶⁴¹ is an apocalyptic number.

It is an amenable number.

43641 is a deficient number, since it is larger than the sum of its proper divisors (24427).

43641 is a wasteful number, since it uses less digits than its factorization.

43641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 389 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 43641 is about 208.9042843026. The cubic root of 43641 is about 35.2072062553.

The spelling of 43641 in words is "forty-three thousand, six hundred forty-one".