12127705 has 4 divisors (see below), whose sum is σ = 14553252. Its totient is φ = 9702160.

The previous prime is 12127697. The next prime is 12127721. The reversal of 12127705 is 50772121.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2468041 + 9659664 = 1571^2 + 3108^2 .

It is not a de Polignac number, because 12127705 - 2³ = 12127697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12127705.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1212766 + ... + 1212775.

It is an arithmetic number, because the mean of its divisors is an integer number (3638313).

Almost surely, 2^12127705 is an apocalyptic number.

It is an amenable number.

12127705 is a deficient number, since it is larger than the sum of its proper divisors (2425547).

12127705 is an equidigital number, since it uses as much as digits as its factorization.

12127705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425546.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 12127705 is about 3482.4854629991. The cubic root of 12127705 is about 229.7521274169.

Adding to 12127705 its reverse (50772121), we get a palindrome (62899826).

The spelling of 12127705 in words is "twelve million, one hundred twenty-seven thousand, seven hundred five".