12826639 has 4 divisors (see below), whose sum is σ = 14659024. Its totient is φ = 10994256.

The previous prime is 12826631. The next prime is 12826643. The reversal of 12826639 is 93662821.

12826639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93662821 = 7 ⋅13380403.

It is not a de Polignac number, because 12826639 - 2³ = 12826631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12826598 and 12826607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12826631) 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, 916182 + ... + 916195.

It is an arithmetic number, because the mean of its divisors is an integer number (3664756).

Almost surely, 2^12826639 is an apocalyptic number.

12826639 is a deficient number, since it is larger than the sum of its proper divisors (1832385).

12826639 is an equidigital number, since it uses as much as digits as its factorization.

12826639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1832384.

The product of its digits is 31104, while the sum is 37.

The square root of 12826639 is about 3581.4297424353. The cubic root of 12826639 is about 234.0835835044.

It can be divided in two parts, 1282 and 6639, that added together give a square (7921 = 89²).

The spelling of 12826639 in words is "twelve million, eight hundred twenty-six thousand, six hundred thirty-nine".