12731840 has 56 divisors (see below), whose sum is σ = 33082992. Its totient is φ = 4628480.

The previous prime is 12731837. The next prime is 12731863. The reversal of 12731840 is 4813721.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712 + ... + 5328.

Almost surely, 2^12731840 is an apocalyptic number.

12731840 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 12731840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16541496).

12731840 is an abundant number, since it is smaller than the sum of its proper divisors (20351152).

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

12731840 is a wasteful number, since it uses less digits than its factorization.

12731840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645 (or 3635 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 12731840 is about 3568.1703995185. The cubic root of 12731840 is about 233.5054693515.

It can be divided in two parts, 1273 and 1840, that added together give a palindrome (3113).

The spelling of 12731840 in words is "twelve million, seven hundred thirty-one thousand, eight hundred forty".