12726403 has 4 divisors (see below), whose sum is σ = 12752208. Its totient is φ = 12700600.

The previous prime is 12726391. The next prime is 12726407. The reversal of 12726403 is 30462721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12726403 - 2²¹ = 10629251 is a prime.

It is a super-2 number, since 2×12726403² = 323922666636818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12726407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12148 + ... + 13153.

It is an arithmetic number, because the mean of its divisors is an integer number (3188052).

Almost surely, 2^12726403 is an apocalyptic number.

12726403 is a deficient number, since it is larger than the sum of its proper divisors (25805).

12726403 is an equidigital number, since it uses as much as digits as its factorization.

12726403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25804.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 12726403 is about 3567.4084431139. The cubic root of 12726403 is about 233.4722259240.

The spelling of 12726403 in words is "twelve million, seven hundred twenty-six thousand, four hundred three".