12911923 has 4 divisors (see below), whose sum is σ = 12970048. Its totient is φ = 12853800.

The previous prime is 12911917. The next prime is 12911933. The reversal of 12911923 is 32911921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12911923 - 2⁹ = 12911411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12911891 and 12911900.

It is not an unprimeable number, because it can be changed into a prime (12911933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28728 + ... + 29173.

It is an arithmetic number, because the mean of its divisors is an integer number (3242512).

Almost surely, 2^12911923 is an apocalyptic number.

12911923 is a deficient number, since it is larger than the sum of its proper divisors (58125).

12911923 is an equidigital number, since it uses as much as digits as its factorization.

12911923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58124.

The product of its digits is 972, while the sum is 28.

The square root of 12911923 is about 3593.3164347160. The cubic root of 12911923 is about 234.6012431777.

The spelling of 12911923 in words is "twelve million, nine hundred eleven thousand, nine hundred twenty-three".