43440839 has 4 divisors (see below), whose sum is σ = 46782456. Its totient is φ = 40099224.

The previous prime is 43440833. The next prime is 43440841. The reversal of 43440839 is 93804434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93804434 = 2 ⋅46902217.

It is a cyclic number.

It is not a de Polignac number, because 43440839 - 2¹⁶ = 43375303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43440799 and 43440808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43440833) 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, 1670789 + ... + 1670814.

It is an arithmetic number, because the mean of its divisors is an integer number (11695614).

Almost surely, 2^43440839 is an apocalyptic number.

43440839 is a deficient number, since it is larger than the sum of its proper divisors (3341617).

43440839 is a wasteful number, since it uses less digits than its factorization.

43440839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341616.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 43440839 is about 6590.9664693427. The cubic root of 43440839 is about 351.5329738456.

The spelling of 43440839 in words is "forty-three million, four hundred forty thousand, eight hundred thirty-nine".