12826640 has 40 divisors (see below), whose sum is σ = 31123008. Its totient is φ = 4906880.

The previous prime is 12826631. The next prime is 12826643. The reversal of 12826640 is 4662821.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (12826643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646 + ... + 5325.

Almost surely, 2^12826640 is an apocalyptic number.

12826640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12826640 is an abundant number, since it is smaller than the sum of its proper divisors (18296368).

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

12826640 is a wasteful number, since it uses less digits than its factorization.

12826640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007 (or 7001 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 12826640 is about 3581.4298820443. The cubic root of 12826640 is about 234.0835895877.

The spelling of 12826640 in words is "twelve million, eight hundred twenty-six thousand, six hundred forty".