731444343444138 has 32 divisors (see below), whose sum is σ = 1472220168842304. Its totient is φ = 242259563100672.

The previous prime is 731444343444127. The next prime is 731444343444193. The reversal of 731444343444138 is 831444343444137.

It is a happy number.

It is a super-2 number, since 2×731444343444138² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99064506 + ... + 106191642.

It is an arithmetic number, because the mean of its divisors is an integer number (46006880276322).

Almost surely, 2^{731444343444138} is an apocalyptic number.

731444343444138 is an abundant number, since it is smaller than the sum of its proper divisors (740775825398166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731444343444138 is a wasteful number, since it uses less digits than its factorization.

731444343444138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7236246.

The product of its digits is 74317824, while the sum is 57.

Subtracting 731444343444138 from its reverse (831444343444137), we obtain a palindrome (99999999999999).

The spelling of 731444343444138 in words is "seven hundred thirty-one trillion, four hundred forty-four billion, three hundred forty-three million, four hundred forty-four thousand, one hundred thirty-eight".