831787138 has 16 divisors (see below), whose sum is σ = 1535607360. Its totient is φ = 329058576.

The previous prime is 831787127. The next prime is 831787139.

It is a happy number.

831787138 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (831787139) 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, 2284948 + ... + 2285311.

It is an arithmetic number, because the mean of its divisors is an integer number (95975460).

Almost surely, 2^831787138 is an apocalyptic number.

831787138 is a deficient number, since it is larger than the sum of its proper divisors (703820222).

831787138 is a wasteful number, since it uses less digits than its factorization.

831787138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570281.

The product of its digits is 225792, while the sum is 46.

The square root of 831787138 is about 28840.7201366401. The cubic root of 831787138 is about 940.4536583424.

The spelling of 831787138 in words is "eight hundred thirty-one million, seven hundred eighty-seven thousand, one hundred thirty-eight".