12726440 has 16 divisors (see below), whose sum is σ = 28634580. Its totient is φ = 5090560.

The previous prime is 12726437. The next prime is 12726443. The reversal of 12726440 is 4462721.

It is an interprime number because it is at equal distance from previous prime (12726437) and next prime (12726443).

It can be written as a sum of positive squares in 2 ways, for example, as 12432676 + 293764 = 3526^2 + 542^2 .

It is not an unprimeable number, because it can be changed into a prime (12726443) 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, 159041 + ... + 159120.

Almost surely, 2^12726440 is an apocalyptic number.

12726440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12726440 is an abundant number, since it is smaller than the sum of its proper divisors (15908140).

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

12726440 is a wasteful number, since it uses less digits than its factorization.

12726440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318172 (or 318168 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 12726440 is about 3567.4136289474. The cubic root of 12726440 is about 233.4724521850.

The spelling of 12726440 in words is "twelve million, seven hundred twenty-six thousand, four hundred forty".