12731904 has 100 divisors (see below), whose sum is σ = 38125164. Its totient is φ = 4230144.

The previous prime is 12731893. The next prime is 12731909. The reversal of 12731904 is 40913721.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731909) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41319 + ... + 41625.

Almost surely, 2^12731904 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 12731904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19062582).

12731904 is an abundant number, since it is smaller than the sum of its proper divisors (25393260).

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

12731904 is an frugal number, since it uses more digits than its factorization.

12731904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 12731904 is about 3568.1793676888. The cubic root of 12731904 is about 233.5058606101.

The spelling of 12731904 in words is "twelve million, seven hundred thirty-one thousand, nine hundred four".