12126605 has 8 divisors (see below), whose sum is σ = 14586264. Its totient is φ = 9678400.

The previous prime is 12126571. The next prime is 12126619. The reversal of 12126605 is 50662121.

It can be written as a sum of positive squares in 4 ways, for example, as 1485961 + 10640644 = 1219^2 + 3262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12126605 - 2⁸ = 12126349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 326 + ... + 4935.

It is an arithmetic number, because the mean of its divisors is an integer number (1823283).

Almost surely, 2^12126605 is an apocalyptic number.

It is an amenable number.

12126605 is a deficient number, since it is larger than the sum of its proper divisors (2459659).

12126605 is an equidigital number, since it uses as much as digits as its factorization.

12126605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5727.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12126605 is about 3482.3275262387. The cubic root of 12126605 is about 229.7451809259.

Adding to 12126605 its reverse (50662121), we get a palindrome (62788726).

The spelling of 12126605 in words is "twelve million, one hundred twenty-six thousand, six hundred five".