43729145 has 4 divisors (see below), whose sum is σ = 52474980. Its totient is φ = 34983312.

The previous prime is 43729139. The next prime is 43729177. The reversal of 43729145 is 54192734.

43729145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28015849 + 15713296 = 5293^2 + 3964^2 .

It is a cyclic number.

It is not a de Polignac number, because 43729145 - 2¹⁰ = 43728121 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4372910 + ... + 4372919.

It is an arithmetic number, because the mean of its divisors is an integer number (13118745).

Almost surely, 2^43729145 is an apocalyptic number.

It is an amenable number.

43729145 is a deficient number, since it is larger than the sum of its proper divisors (8745835).

43729145 is an equidigital number, since it uses as much as digits as its factorization.

43729145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8745834.

The product of its digits is 30240, while the sum is 35.

The square root of 43729145 is about 6612.8015999272. The cubic root of 43729145 is about 352.3089385940.

The spelling of 43729145 in words is "forty-three million, seven hundred twenty-nine thousand, one hundred forty-five".