43634 has 4 divisors (see below), whose sum is σ = 65454. Its totient is φ = 21816.

The previous prime is 43633. The next prime is 43649.

It is a happy number.

43634 is nontrivially palindromic in base 10.

43634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 34225 + 9409 = 185^2 + 97^2 .

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (43633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907 + ... + 10910.

2⁴³⁶³⁴ is an apocalyptic number.

43634 is a deficient number, since it is larger than the sum of its proper divisors (21820).

43634 is a wasteful number, since it uses less digits than its factorization.

43634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21819.

The product of its digits is 864, while the sum is 20.

The square root of 43634 is about 208.8875295464. The cubic root of 43634 is about 35.2053237471.

The spelling of 43634 in words is "forty-three thousand, six hundred thirty-four".