12905043909 has 32 divisors (see below), whose sum is σ = 17972637696. Its totient is φ = 8227397760.

The previous prime is 12905043887. The next prime is 12905043923. The reversal of 12905043909 is 90934050921.

It is not a de Polignac number, because 12905043909 - 2⁸ = 12905043653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12905041909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4645729 + ... + 4648505.

It is an arithmetic number, because the mean of its divisors is an integer number (561644928).

Almost surely, 2^12905043909 is an apocalyptic number.

It is an amenable number.

12905043909 is a deficient number, since it is larger than the sum of its proper divisors (5067593787).

12905043909 is a wasteful number, since it uses less digits than its factorization.

12905043909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 12905043909 in words is "twelve billion, nine hundred five million, forty-three thousand, nine hundred nine".