43684561 has 8 divisors (see below), whose sum is σ = 44717184. Its totient is φ = 42659760.

The previous prime is 43684547. The next prime is 43684579. The reversal of 43684561 is 16548634.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43684561 - 2⁹ = 43684049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43684561.

It is not an unprimeable number, because it can be changed into a prime (43684261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10216 + ... + 13846.

It is an arithmetic number, because the mean of its divisors is an integer number (5589648).

Almost surely, 2^43684561 is an apocalyptic number.

It is an amenable number.

43684561 is a deficient number, since it is larger than the sum of its proper divisors (1032623).

43684561 is a wasteful number, since it uses less digits than its factorization.

43684561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911.

The product of its digits is 69120, while the sum is 37.

The square root of 43684561 is about 6609.4297030833. The cubic root of 43684561 is about 352.1891658209.

The spelling of 43684561 in words is "forty-three million, six hundred eighty-four thousand, five hundred sixty-one".