12729778 has 8 divisors (see below), whose sum is σ = 19710720. Its totient is φ = 6159540.

The previous prime is 12729727. The next prime is 12729779. The reversal of 12729778 is 87792721.

It is a happy number.

12729778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 102598 + ... + 102721.

It is an arithmetic number, because the mean of its divisors is an integer number (2463840).

Almost surely, 2^12729778 is an apocalyptic number.

12729778 is a deficient number, since it is larger than the sum of its proper divisors (6980942).

12729778 is a wasteful number, since it uses less digits than its factorization.

12729778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205352.

The product of its digits is 98784, while the sum is 43.

The square root of 12729778 is about 3567.8814442187. The cubic root of 12729778 is about 233.4928627873.

The spelling of 12729778 in words is "twelve million, seven hundred twenty-nine thousand, seven hundred seventy-eight".