43240639073 has 4 divisors (see below), whose sum is σ = 43315580100. Its totient is φ = 43165698048.

The previous prime is 43240639049. The next prime is 43240639093. The reversal of 43240639073 is 37093604234.

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 42647619169 + 593019904 = 206513^2 + 24352^2 .

It is a cyclic number.

It is not a de Polignac number, because 43240639073 - 2¹⁸ = 43240376929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43240639073.

It is not an unprimeable number, because it can be changed into a prime (43240639093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37469648 + ... + 37470801.

It is an arithmetic number, because the mean of its divisors is an integer number (10828895025).

Almost surely, 2^43240639073 is an apocalyptic number.

It is an amenable number.

43240639073 is a deficient number, since it is larger than the sum of its proper divisors (74941027).

43240639073 is an equidigital number, since it uses as much as digits as its factorization.

43240639073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74941026.

The product of its (nonzero) digits is 326592, while the sum is 41.

The spelling of 43240639073 in words is "forty-three billion, two hundred forty million, six hundred thirty-nine thousand, seventy-three".