12705215 has 4 divisors (see below), whose sum is σ = 15246264. Its totient is φ = 10164168.

The previous prime is 12705211. The next prime is 12705229. The reversal of 12705215 is 51250721.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12705215 - 2² = 12705211 is a prime.

It is a super-2 number, since 2×12705215² = 322844976392450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12705211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270517 + ... + 1270526.

It is an arithmetic number, because the mean of its divisors is an integer number (3811566).

Almost surely, 2^12705215 is an apocalyptic number.

12705215 is a deficient number, since it is larger than the sum of its proper divisors (2541049).

12705215 is an equidigital number, since it uses as much as digits as its factorization.

12705215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541048.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 12705215 is about 3564.4375432879. The cubic root of 12705215 is about 233.3425858009.

Adding to 12705215 its reverse (51250721), we get a palindrome (63955936).

The spelling of 12705215 in words is "twelve million, seven hundred five thousand, two hundred fifteen".