12731745 has 32 divisors (see below), whose sum is σ = 22176000. Its totient is φ = 6200064.

The previous prime is 12731743. The next prime is 12731753. The reversal of 12731745 is 54713721.

It is not a de Polignac number, because 12731745 - 2¹ = 12731743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12731743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20956 + ... + 21554.

It is an arithmetic number, because the mean of its divisors is an integer number (693000).

Almost surely, 2^12731745 is an apocalyptic number.

12731745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12731745 is a deficient number, since it is larger than the sum of its proper divisors (9444255).

12731745 is a wasteful number, since it uses less digits than its factorization.

12731745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 5880, while the sum is 30.

The square root of 12731745 is about 3568.1570873492. The cubic root of 12731745 is about 233.5048885746.

The spelling of 12731745 in words is "twelve million, seven hundred thirty-one thousand, seven hundred forty-five".