12906978 has 32 divisors (see below), whose sum is σ = 31238784. Its totient is φ = 3470592.

The previous prime is 12906977. The next prime is 12907007. The reversal of 12906978 is 87960921.

12906978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (12906977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8325 + ... + 9752.

It is an arithmetic number, because the mean of its divisors is an integer number (976212).

Almost surely, 2^12906978 is an apocalyptic number.

12906978 is an abundant number, since it is smaller than the sum of its proper divisors (18331806).

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

12906978 is a wasteful number, since it uses less digits than its factorization.

12906978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18106.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 12906978 is about 3592.6282858097. The cubic root of 12906978 is about 234.5712902090.

The spelling of 12906978 in words is "twelve million, nine hundred six thousand, nine hundred seventy-eight".