12880905 has 16 divisors (see below), whose sum is σ = 20701440. Its totient is φ = 6839168.

The previous prime is 12880859. The next prime is 12880913. The reversal of 12880905 is 50908821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 12880905 - 2⁸ = 12880649 is a prime.

It is a Curzon 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, 1789 + ... + 5381.

It is an arithmetic number, because the mean of its divisors is an integer number (1293840).

Almost surely, 2^12880905 is an apocalyptic number.

12880905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12880905 is a deficient number, since it is larger than the sum of its proper divisors (7820535).

12880905 is a wasteful number, since it uses less digits than its factorization.

12880905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 12880905 is about 3588.9977709662. The cubic root of 12880905 is about 234.4132335848.

The spelling of 12880905 in words is "twelve million, eight hundred eighty thousand, nine hundred five".