12806905 has 8 divisors (see below), whose sum is σ = 15725952. Its totient is φ = 10007088.

The previous prime is 12806903. The next prime is 12806923. The reversal of 12806905 is 50960821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12806905 - 2¹ = 12806903 is a prime.

It is a super-3 number, since 3×12806905³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12806903) 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, 29569 + ... + 29998.

It is an arithmetic number, because the mean of its divisors is an integer number (1965744).

Almost surely, 2^12806905 is an apocalyptic number.

It is an amenable number.

12806905 is a deficient number, since it is larger than the sum of its proper divisors (2919047).

12806905 is an equidigital number, since it uses as much as digits as its factorization.

12806905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59615.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 12806905 is about 3578.6736369778. The cubic root of 12806905 is about 233.9634747091.

The spelling of 12806905 in words is "twelve million, eight hundred six thousand, nine hundred five".