831404138 has 16 divisors (see below), whose sum is σ = 1302678720. Its totient is φ = 397215456.

The previous prime is 831404131. The next prime is 831404141.

831404138 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (831404131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38006 + ... + 55742.

It is an arithmetic number, because the mean of its divisors is an integer number (81417420).

Almost surely, 2^831404138 is an apocalyptic number.

831404138 is a deficient number, since it is larger than the sum of its proper divisors (471274582).

831404138 is a wasteful number, since it uses less digits than its factorization.

831404138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18781.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 831404138 is about 28834.0794547008. The cubic root of 831404138 is about 940.3092908582.

It can be divided in two parts, 83140 and 4138, that added together give a palindrome (87278).

The spelling of 831404138 in words is "eight hundred thirty-one million, four hundred four thousand, one hundred thirty-eight".