43642 has 4 divisors (see below), whose sum is σ = 65466. Its totient is φ = 21820.

The previous prime is 43633. The next prime is 43649. The reversal of 43642 is 24634.

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., 35721 + 7921 = 189^2 + 89^2 .

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 as a sum of consecutive naturals, namely, 10909 + ... + 10912.

2⁴³⁶⁴² is an apocalyptic number.

43642 is a deficient number, since it is larger than the sum of its proper divisors (21824).

43642 is a wasteful number, since it uses less digits than its factorization.

43642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21823.

The product of its digits is 576, while the sum is 19.

The square root of 43642 is about 208.9066777296. The cubic root of 43642 is about 35.2074751686.

The spelling of 43642 in words is "forty-three thousand, six hundred forty-two".