12816978 has 8 divisors (see below), whose sum is σ = 25633968. Its totient is φ = 4272324.

The previous prime is 12816977. The next prime is 12816989. The reversal of 12816978 is 87961821.

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

12816978 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12816971) 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, 1068076 + ... + 1068087.

It is an arithmetic number, because the mean of its divisors is an integer number (3204246).

Almost surely, 2^12816978 is an apocalyptic number.

12816978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12816978 is a wasteful number, since it uses less digits than its factorization.

12816978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136168.

The product of its digits is 48384, while the sum is 42.

The square root of 12816978 is about 3580.0807253468. The cubic root of 12816978 is about 234.0247983069.

The spelling of 12816978 in words is "twelve million, eight hundred sixteen thousand, nine hundred seventy-eight".