43640809139 has 6 divisors (see below), whose sum is σ = 44731182060. Its totient is φ = 42576397520.

The previous prime is 43640809133. The next prime is 43640809141. The reversal of 43640809139 is 93190804634.

It is a happy number.

43640809139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 43640809139 - 2²⁴ = 43624031923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43640809093 and 43640809102.

It is not an unprimeable number, because it can be changed into a prime (43640809133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12978929 + ... + 12982290.

It is an arithmetic number, because the mean of its divisors is an integer number (7455197010).

Almost surely, 2^43640809139 is an apocalyptic number.

43640809139 is a deficient number, since it is larger than the sum of its proper divisors (1090372921).

43640809139 is an equidigital number, since it uses as much as digits as its factorization.

43640809139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25961301 (or 25961260 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 47.

The spelling of 43640809139 in words is "forty-three billion, six hundred forty million, eight hundred nine thousand, one hundred thirty-nine".