12831940 has 96 divisors (see below), whose sum is σ = 32223744. Its totient is φ = 4239360.

The previous prime is 12831937. The next prime is 12831961. The reversal of 12831940 is 4913821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12831899 and 12831908.

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 31 ways as a sum of consecutive naturals, for example, 175744 + ... + 175816.

It is an arithmetic number, because the mean of its divisors is an integer number (335664).

Almost surely, 2^12831940 is an apocalyptic number.

12831940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12831940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16111872).

12831940 is an abundant number, since it is smaller than the sum of its proper divisors (19391804).

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

12831940 is a wasteful number, since it uses less digits than its factorization.

12831940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 12831940 is about 3582.1697335553. The cubic root of 12831940 is about 234.1158264578.

It can be divided in two parts, 1283 and 1940, that added together give a palindrome (3223).

The spelling of 12831940 in words is "twelve million, eight hundred thirty-one thousand, nine hundred forty".