43749 has 6 divisors (see below), whose sum is σ = 63206. Its totient is φ = 29160.

The previous prime is 43721. The next prime is 43753. The reversal of 43749 is 94734.

It can be written as a sum of positive squares in only one way, i.e., 42849 + 900 = 207^2 + 30^2 .

It is not a de Polignac number, because 43749 - 2⁵ = 43717 is a prime.

It is a Duffinian number.

It is a plaindrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2422 + ... + 2439.

2⁴³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

43749 is a deficient number, since it is larger than the sum of its proper divisors (19457).

43749 is a wasteful number, since it uses less digits than its factorization.

43749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4867 (or 4864 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 43749 is about 209.1626161626. The cubic root of 43749 is about 35.2362251898.

The spelling of 43749 in words is "forty-three thousand, seven hundred forty-nine".