12820978 has 8 divisors (see below), whose sum is σ = 19258668. Its totient is φ = 6401424.

The previous prime is 12820963. The next prime is 12820979. The reversal of 12820978 is 87902821.

12820978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10738729 + 2082249 = 3277^2 + 1443^2 .

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 (12820979) 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, 2601 + ... + 5692.

Almost surely, 2^12820978 is an apocalyptic number.

12820978 is a deficient number, since it is larger than the sum of its proper divisors (6437690).

12820978 is an equidigital number, since it uses as much as digits as its factorization.

12820978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9068.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 12820978 is about 3580.6393283882. The cubic root of 12820978 is about 234.0491410662.

The spelling of 12820978 in words is "twelve million, eight hundred twenty thousand, nine hundred seventy-eight".