12809340 has 60 divisors (see below), whose sum is σ = 40188456. Its totient is φ = 3415392.

The previous prime is 12809327. The next prime is 12809351. The reversal of 12809340 is 4390821.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2334 + ... + 5573.

Almost surely, 2^12809340 is an apocalyptic number.

12809340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12809340 is an abundant number, since it is smaller than the sum of its proper divisors (27379116).

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

12809340 is a wasteful number, since it uses less digits than its factorization.

12809340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7928 (or 7917 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12809340 is about 3579.0138306522. The cubic root of 12809340 is about 233.9783017356.

The spelling of 12809340 in words is "twelve million, eight hundred nine thousand, three hundred forty".