43749729 has 12 divisors (see below), whose sum is σ = 63278800. Its totient is φ = 29127384.

The previous prime is 43749709. The next prime is 43749743. The reversal of 43749729 is 92794734.

It is not a de Polignac number, because 43749729 - 2¹⁵ = 43716961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43749709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4902 + ... + 10560.

Almost surely, 2^43749729 is an apocalyptic number.

It is an amenable number.

43749729 is a deficient number, since it is larger than the sum of its proper divisors (19529071).

43749729 is a wasteful number, since it uses less digits than its factorization.

43749729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524 (or 6521 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 43749729 is about 6614.3577919553. The cubic root of 43749729 is about 352.3642090520.

The spelling of 43749729 in words is "forty-three million, seven hundred forty-nine thousand, seven hundred twenty-nine".