12105945 has 24 divisors (see below), whose sum is σ = 22089600. Its totient is φ = 6116256.

The previous prime is 12105941. The next prime is 12105979. The reversal of 12105945 is 54950121.

It is not a de Polignac number, because 12105945 - 2² = 12105941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12105941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6225 + ... + 7934.

It is an arithmetic number, because the mean of its divisors is an integer number (920400).

Almost surely, 2^12105945 is an apocalyptic number.

12105945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12105945 is a deficient number, since it is larger than the sum of its proper divisors (9983655).

12105945 is a wasteful number, since it uses less digits than its factorization.

12105945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14189 (or 14186 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 12105945 is about 3479.3598549158. The cubic root of 12105945 is about 229.6146350851.

It can be divided in two parts, 121059 and 45, that added together give a square (121104 = 348²).

The spelling of 12105945 in words is "twelve million, one hundred five thousand, nine hundred forty-five".