43347987809 has 4 divisors (see below), whose sum is σ = 49540557504. Its totient is φ = 37155418116.

The previous prime is 43347987803. The next prime is 43347987871. The reversal of 43347987809 is 90878974334.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43347987809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43347987803) 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, 3096284837 + ... + 3096284850.

It is an arithmetic number, because the mean of its divisors is an integer number (12385139376).

Almost surely, 2^43347987809 is an apocalyptic number.

It is an amenable number.

43347987809 is a deficient number, since it is larger than the sum of its proper divisors (6192569695).

43347987809 is an equidigital number, since it uses as much as digits as its factorization.

43347987809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6192569694.

The product of its (nonzero) digits is 36578304, while the sum is 62.

The spelling of 43347987809 in words is "forty-three billion, three hundred forty-seven million, nine hundred eighty-seven thousand, eight hundred nine".