84440139505 has 16 divisors (see below), whose sum is σ = 101633875200. Its totient is φ = 67348609920.

The previous prime is 84440139503. The next prime is 84440139547. The reversal of 84440139505 is 50593104448.

It is not a de Polignac number, because 84440139505 - 2¹ = 84440139503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84440139503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2291416 + ... + 2327974.

It is an arithmetic number, because the mean of its divisors is an integer number (6352117200).

Almost surely, 2^84440139505 is an apocalyptic number.

It is an amenable number.

84440139505 is a deficient number, since it is larger than the sum of its proper divisors (17193735695).

84440139505 is a wasteful number, since it uses less digits than its factorization.

84440139505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37944.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 84440139505 in words is "eighty-four billion, four hundred forty million, one hundred thirty-nine thousand, five hundred five".