12999805 has 16 divisors (see below), whose sum is σ = 19200384. Its totient is φ = 8228160.

The previous prime is 12999799. The next prime is 12999863. The reversal of 12999805 is 50899921.

It is not a de Polignac number, because 12999805 - 2³ = 12999797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13831 + ... + 14740.

It is an arithmetic number, because the mean of its divisors is an integer number (1200024).

Almost surely, 2^12999805 is an apocalyptic number.

It is an amenable number.

12999805 is a deficient number, since it is larger than the sum of its proper divisors (6200579).

12999805 is a wasteful number, since it uses less digits than its factorization.

12999805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28596.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 12999805 is about 3605.5242337280. The cubic root of 12999805 is about 235.1322930989.

The spelling of 12999805 in words is "twelve million, nine hundred ninety-nine thousand, eight hundred five".