12811923 has 6 divisors (see below), whose sum is σ = 18506124. Its totient is φ = 8541276.

The previous prime is 12811907. The next prime is 12811927. The reversal of 12811923 is 32911821.

It is not a de Polignac number, because 12811923 - 2⁴ = 12811907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12811927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 711765 + ... + 711782.

It is an arithmetic number, because the mean of its divisors is an integer number (3084354).

Almost surely, 2^12811923 is an apocalyptic number.

12811923 is a deficient number, since it is larger than the sum of its proper divisors (5694201).

12811923 is a wasteful number, since it uses less digits than its factorization.

12811923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423553 (or 1423550 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12811923 is about 3579.3746660555. The cubic root of 12811923 is about 233.9940278993.

The spelling of 12811923 in words is "twelve million, eight hundred eleven thousand, nine hundred twenty-three".