43000073 has 4 divisors (see below), whose sum is σ = 43070160. Its totient is φ = 42929988.

The previous prime is 43000063. The next prime is 43000081. The reversal of 43000073 is 37000034.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37000034 = 2 ⋅18500017.

It is a cyclic number.

It is not a de Polignac number, because 43000073 - 2⁴ = 43000057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43000063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34115 + ... + 35352.

It is an arithmetic number, because the mean of its divisors is an integer number (10767540).

Almost surely, 2^43000073 is an apocalyptic number.

It is an amenable number.

43000073 is a deficient number, since it is larger than the sum of its proper divisors (70087).

43000073 is an equidigital number, since it uses as much as digits as its factorization.

43000073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70086.

The product of its (nonzero) digits is 252, while the sum is 17.

The square root of 43000073 is about 6557.4440904975. Note that the first 3 decimals coincide. The cubic root of 43000073 is about 350.3400042929.

The spelling of 43000073 in words is "forty-three million, seventy-three", and thus it is an aban number and an uban number.