12729775 has 12 divisors (see below), whose sum is σ = 15841000. Its totient is φ = 10147680.

The previous prime is 12729727. The next prime is 12729779. The reversal of 12729775 is 57792721.

It is a happy number.

It is not a de Polignac number, because 12729775 - 2¹¹ = 12727727 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7996 + ... + 9454.

Almost surely, 2^12729775 is an apocalyptic number.

12729775 is a deficient number, since it is larger than the sum of its proper divisors (3111225).

12729775 is a wasteful number, since it uses less digits than its factorization.

12729775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818 (or 1813 counting only the distinct ones).

The product of its digits is 61740, while the sum is 40.

The square root of 12729775 is about 3567.8810238011. The cubic root of 12729775 is about 233.4928444451.

The spelling of 12729775 in words is "twelve million, seven hundred twenty-nine thousand, seven hundred seventy-five".