12729975 has 12 divisors (see below), whose sum is σ = 21047016. Its totient is φ = 6789280.

The previous prime is 12729973. The next prime is 12729979. The reversal of 12729975 is 57992721.

It is not a de Polignac number, because 12729975 - 2¹ = 12729973 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12729973) 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, 84792 + ... + 84941.

It is an arithmetic number, because the mean of its divisors is an integer number (1753918).

Almost surely, 2^12729975 is an apocalyptic number.

12729975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12729975 is a deficient number, since it is larger than the sum of its proper divisors (8317041).

12729975 is a wasteful number, since it uses less digits than its factorization.

12729975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169746 (or 169741 counting only the distinct ones).

The product of its digits is 79380, while the sum is 42.

The square root of 12729975 is about 3567.9090515314. The cubic root of 12729975 is about 233.4940672560.

The spelling of 12729975 in words is "twelve million, seven hundred twenty-nine thousand, nine hundred seventy-five".