12729231 has 20 divisors (see below), whose sum is σ = 19674600. Its totient is φ = 8192016.

The previous prime is 12729217. The next prime is 12729239. The reversal of 12729231 is 13292721.

It is not a de Polignac number, because 12729231 - 2¹³ = 12721039 is a prime.

It is a super-2 number, since 2×12729231² = 324066643702722, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 12729195 and 12729204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 361 + ... + 5058.

It is an arithmetic number, because the mean of its divisors is an integer number (983730).

Almost surely, 2^12729231 is an apocalyptic number.

12729231 is a deficient number, since it is larger than the sum of its proper divisors (6945369).

12729231 is an equidigital number, since it uses as much as digits as its factorization.

12729231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460 (or 5451 counting only the distinct ones).

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

The square root of 12729231 is about 3567.8047872606. The cubic root of 12729231 is about 233.4895183345.

The spelling of 12729231 in words is "twelve million, seven hundred twenty-nine thousand, two hundred thirty-one".