12978146 has 8 divisors (see below), whose sum is σ = 19483740. Its totient is φ = 6483568.

The previous prime is 12978139. The next prime is 12978169. The reversal of 12978146 is 64187921.

It can be written as a sum of positive squares in 2 ways, for example, as 9954025 + 3024121 = 3155^2 + 1739^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520 + ... + 5316.

Almost surely, 2^12978146 is an apocalyptic number.

12978146 is a deficient number, since it is larger than the sum of its proper divisors (6505594).

12978146 is a wasteful number, since it uses less digits than its factorization.

12978146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508.

The product of its digits is 24192, while the sum is 38.

The square root of 12978146 is about 3602.5193962004. The cubic root of 12978146 is about 235.0016357212.

The spelling of 12978146 in words is "twelve million, nine hundred seventy-eight thousand, one hundred forty-six".