12109923 has 24 divisors (see below), whose sum is σ = 20107776. Its totient is φ = 6879600.

The previous prime is 12109919. The next prime is 12109931. The reversal of 12109923 is 32990121.

It is not a de Polignac number, because 12109923 - 2² = 12109919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12109913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12838 + ... + 13748.

It is an arithmetic number, because the mean of its divisors is an integer number (837824).

Almost surely, 2^12109923 is an apocalyptic number.

12109923 is a deficient number, since it is larger than the sum of its proper divisors (7997853).

12109923 is a wasteful number, since it uses less digits than its factorization.

12109923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 12109923 is about 3479.9314648424. The cubic root of 12109923 is about 229.6397827017.

The spelling of 12109923 in words is "twelve million, one hundred nine thousand, nine hundred twenty-three".