12978522 has 32 divisors (see below), whose sum is σ = 29775360. Its totient is φ = 4186080.

The previous prime is 12978517. The next prime is 12978529. The reversal of 12978522 is 22587921.

12978522 is a `hidden beast` number, since 129 + 7 + 8 + 522 = 666.

It is not an unprimeable number, because it can be changed into a prime (12978529) 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, 2203 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (930480).

Almost surely, 2^12978522 is an apocalyptic number.

12978522 is an abundant number, since it is smaller than the sum of its proper divisors (16796838).

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

12978522 is a wasteful number, since it uses less digits than its factorization.

12978522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7795 (or 7789 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12978522 is about 3602.5715815234. The cubic root of 12978522 is about 235.0039051713.

The spelling of 12978522 in words is "twelve million, nine hundred seventy-eight thousand, five hundred twenty-two".