12781132 has 72 divisors (see below), whose sum is σ = 28817376. Its totient is φ = 4852224.

The previous prime is 12781117. The next prime is 12781159. The reversal of 12781132 is 23118721.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12781097 and 12781106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175048 + ... + 175120.

Almost surely, 2^12781132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12781132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14408688).

12781132 is an abundant number, since it is smaller than the sum of its proper divisors (16036244).

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

12781132 is a wasteful number, since it uses less digits than its factorization.

12781132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 132 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 12781132 is about 3575.0709083877. The cubic root of 12781132 is about 233.8064242714.

Adding to 12781132 its reverse (23118721), we get a palindrome (35899853).

The spelling of 12781132 in words is "twelve million, seven hundred eighty-one thousand, one hundred thirty-two".