43939021 has 8 divisors (see below), whose sum is σ = 50308544. Its totient is φ = 37592640.

The previous prime is 43939019. The next prime is 43939061. The reversal of 43939021 is 12093934.

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 43939021 - 2¹ = 43939019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43939061) 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, 1500 + ... + 9493.

It is an arithmetic number, because the mean of its divisors is an integer number (6288568).

Almost surely, 2^43939021 is an apocalyptic number.

It is an amenable number.

43939021 is a deficient number, since it is larger than the sum of its proper divisors (6369523).

43939021 is a wasteful number, since it uses less digits than its factorization.

43939021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11571.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 43939021 is about 6628.6515219915. The cubic root of 43939021 is about 352.8716694132.

The spelling of 43939021 in words is "forty-three million, nine hundred thirty-nine thousand, twenty-one".