43939 has 4 divisors (see below), whose sum is σ = 50224. Its totient is φ = 37656.

The previous prime is 43933. The next prime is 43943. The reversal of 43939 is 93934.

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

It is a cyclic number.

It is not a de Polignac number, because 43939 - 2⁹ = 43427 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (43933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132 + ... + 3145.

It is an arithmetic number, because the mean of its divisors is an integer number (12556).

2⁴³⁹³⁹ is an apocalyptic number.

43939 is a deficient number, since it is larger than the sum of its proper divisors (6285).

43939 is an equidigital number, since it uses as much as digits as its factorization.

43939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6284.

The product of its digits is 2916, while the sum is 28.

The square root of 43939 is about 209.6163161588. The cubic root of 43939 is about 35.2871613197.

The spelling of 43939 in words is "forty-three thousand, nine hundred thirty-nine".