43921 has 4 divisors (see below), whose sum is σ = 44352. Its totient is φ = 43492.

The previous prime is 43913. The next prime is 43933. The reversal of 43921 is 12934.

43921 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 43921 - 2³ = 43913 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (43951) 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, 36 + ... + 298.

It is an arithmetic number, because the mean of its divisors is an integer number (11088).

2⁴³⁹²¹ is an apocalyptic number.

It is an amenable number.

43921 is a deficient number, since it is larger than the sum of its proper divisors (431).

43921 is a wasteful number, since it uses less digits than its factorization.

43921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its digits is 216, while the sum is 19.

The square root of 43921 is about 209.5733761717. The cubic root of 43921 is about 35.2823420956.

The spelling of 43921 in words is "forty-three thousand, nine hundred twenty-one".