12809655 has 12 divisors (see below), whose sum is σ = 22203480. Its totient is φ = 6831792.

The previous prime is 12809647. The next prime is 12809701. The reversal of 12809655 is 55690821.

It is a happy number.

It is not a de Polignac number, because 12809655 - 2³ = 12809647 is a prime.

It is a super-2 number, since 2×12809655² = 328174522438050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142285 + ... + 142374.

It is an arithmetic number, because the mean of its divisors is an integer number (1850290).

Almost surely, 2^12809655 is an apocalyptic number.

12809655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12809655 is a deficient number, since it is larger than the sum of its proper divisors (9393825).

12809655 is a wasteful number, since it uses less digits than its factorization.

12809655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284670 (or 284667 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 12809655 is about 3579.0578369174. The cubic root of 12809655 is about 233.9802196736.

The spelling of 12809655 in words is "twelve million, eight hundred nine thousand, six hundred fifty-five".