12426229729 has 9 divisors (see below), whose sum is σ = 13116899217. Its totient is φ = 11770211124.

The previous prime is 12426229709. The next prime is 12426229769. The reversal of 12426229729 is 92792262421.

The square root of 12426229729 is 111473.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 12426229729 - 2¹³ = 12426221537 is a prime.

It is a super-2 number, since 2×12426229729² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12426229709) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2115054 + ... + 2120920.

Almost surely, 2^12426229729 is an apocalyptic number.

12426229729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12426229729 is the 111473-rd square number.

12426229729 is the 55737-th centered octagonal number.

It is an amenable number.

12426229729 is a deficient number, since it is larger than the sum of its proper divisors (690669488).

12426229729 is an frugal number, since it uses more digits than its factorization.

12426229729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11772 (or 5886 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The spelling of 12426229729 in words is "twelve billion, four hundred twenty-six million, two hundred twenty-nine thousand, seven hundred twenty-nine".