83805442139 has 4 divisors (see below), whose sum is σ = 83946767256. Its totient is φ = 83664117024.

The previous prime is 83805442057. The next prime is 83805442141. The reversal of 83805442139 is 93124450838.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83805442139 is a prime.

It is a super-2 number, since 2×83805442139² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 83805442093 and 83805442102.

It is not an unprimeable number, because it can be changed into a prime (83805442159) 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, 70661669 + ... + 70662854.

It is an arithmetic number, because the mean of its divisors is an integer number (20986691814).

Almost surely, 2^83805442139 is an apocalyptic number.

83805442139 is a deficient number, since it is larger than the sum of its proper divisors (141325117).

83805442139 is a wasteful number, since it uses less digits than its factorization.

83805442139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141325116.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 83805442139 in words is "eighty-three billion, eight hundred five million, four hundred forty-two thousand, one hundred thirty-nine".