12142705 has 4 divisors (see below), whose sum is σ = 14571252. Its totient is φ = 9714160.

The previous prime is 12142703. The next prime is 12142717. The reversal of 12142705 is 50724121.

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 5424241 + 6718464 = 2329^2 + 2592^2 .

It is not a de Polignac number, because 12142705 - 2¹ = 12142703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12142703) 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 3 ways as a sum of consecutive naturals, for example, 1214266 + ... + 1214275.

It is an arithmetic number, because the mean of its divisors is an integer number (3642813).

Almost surely, 2^12142705 is an apocalyptic number.

It is an amenable number.

12142705 is a deficient number, since it is larger than the sum of its proper divisors (2428547).

12142705 is an equidigital number, since it uses as much as digits as its factorization.

12142705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428546.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 12142705 is about 3484.6384317458. The cubic root of 12142705 is about 229.8468104054.

Adding to 12142705 its reverse (50724121), we get a palindrome (62866826).

The spelling of 12142705 in words is "twelve million, one hundred forty-two thousand, seven hundred five".