12731000 has 64 divisors (see below), whose sum is σ = 30888000. Its totient is φ = 4905600.

The previous prime is 12730979. The next prime is 12731003. The reversal of 12731000 is 13721.

It is a super-2 number, since 2×12731000² = 324156722000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28781 + ... + 29219.

It is an arithmetic number, because the mean of its divisors is an integer number (482625).

Almost surely, 2^12731000 is an apocalyptic number.

12731000 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 12731000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15444000).

12731000 is an abundant number, since it is smaller than the sum of its proper divisors (18157000).

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

12731000 is a wasteful number, since it uses less digits than its factorization.

12731000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 12731000 is about 3568.0526901939. The cubic root of 12731000 is about 233.5003339610.

Adding to 12731000 its reverse (13721), we get a palindrome (12744721).

The spelling of 12731000 in words is "twelve million, seven hundred thirty-one thousand".