43989739 has 4 divisors (see below), whose sum is σ = 44008056. Its totient is φ = 43971424.

The previous prime is 43989709. The next prime is 43989749. The reversal of 43989739 is 93798934.

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 43989739 - 2⁷ = 43989611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43989709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4894 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (11002014).

Almost surely, 2^43989739 is an apocalyptic number.

43989739 is a deficient number, since it is larger than the sum of its proper divisors (18317).

43989739 is a wasteful number, since it uses less digits than its factorization.

43989739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18316.

The product of its digits is 1469664, while the sum is 52.

The square root of 43989739 is about 6632.4760836357. The cubic root of 43989739 is about 353.0073882897.

The spelling of 43989739 in words is "forty-three million, nine hundred eighty-nine thousand, seven hundred thirty-nine".