43703721 has 12 divisors (see below), whose sum is σ = 63222640. Its totient is φ = 29091960.

The previous prime is 43703689. The next prime is 43703731. The reversal of 43703721 is 12730734.

It is not a de Polignac number, because 43703721 - 2⁵ = 43703689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43703731) 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, 3366 + ... + 9936.

Almost surely, 2^43703721 is an apocalyptic number.

It is an amenable number.

43703721 is a deficient number, since it is larger than the sum of its proper divisors (19518919).

43703721 is a wasteful number, since it uses less digits than its factorization.

43703721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7316 (or 7313 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 43703721 is about 6610.8789884553. The cubic root of 43703721 is about 352.2406482208.

The spelling of 43703721 in words is "forty-three million, seven hundred three thousand, seven hundred twenty-one".