12978229 has 4 divisors (see below), whose sum is σ = 14158080. Its totient is φ = 11798380.

The previous prime is 12978227. The next prime is 12978239. The reversal of 12978229 is 92287921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12978229 - 2¹ = 12978227 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12978191 and 12978200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978227) 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, 589909 + ... + 589930.

It is an arithmetic number, because the mean of its divisors is an integer number (3539520).

Almost surely, 2^12978229 is an apocalyptic number.

It is an amenable number.

12978229 is a deficient number, since it is larger than the sum of its proper divisors (1179851).

12978229 is a wasteful number, since it uses less digits than its factorization.

12978229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179850.

The product of its digits is 36288, while the sum is 40.

The square root of 12978229 is about 3602.5309158979. The cubic root of 12978229 is about 235.0021366940.

The spelling of 12978229 in words is "twelve million, nine hundred seventy-eight thousand, two hundred twenty-nine".