12124905 has 24 divisors (see below), whose sum is σ = 21011328. Its totient is φ = 5967936.

The previous prime is 12124901. The next prime is 12124939. The reversal of 12124905 is 50942121.

It is not a de Polignac number, because 12124905 - 2² = 12124901 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12124901) 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, 144 + ... + 4926.

It is an arithmetic number, because the mean of its divisors is an integer number (875472).

Almost surely, 2^12124905 is an apocalyptic number.

12124905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12124905 is a deficient number, since it is larger than the sum of its proper divisors (8886423).

12124905 is a wasteful number, since it uses less digits than its factorization.

12124905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4817 (or 4804 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 12124905 is about 3482.0834280643. The cubic root of 12124905 is about 229.7344446135.

The spelling of 12124905 in words is "twelve million, one hundred twenty-four thousand, nine hundred five".