831389994 has 48 divisors (see below), whose sum is σ = 1880598720. Its totient is φ = 275270400.

The previous prime is 831389971. The next prime is 831390041. The reversal of 831389994 is 499983138.

It is a super-3 number, since 3×831389994³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 831389994.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67722 + ... + 79050.

It is an arithmetic number, because the mean of its divisors is an integer number (39179140).

Almost surely, 2^831389994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 831389994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940299360).

831389994 is an abundant number, since it is smaller than the sum of its proper divisors (1049208726).

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

831389994 is a wasteful number, since it uses less digits than its factorization.

831389994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11497 (or 11485 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 831389994 is about 28833.8341883281. The cubic root of 831389994 is about 940.3039585898.

The spelling of 831389994 in words is "eight hundred thirty-one million, three hundred eighty-nine thousand, nine hundred ninety-four".