12978042 has 48 divisors (see below), whose sum is σ = 32946912. Its totient is φ = 3370080.

The previous prime is 12978023. The next prime is 12978047. The reversal of 12978042 is 24087921.

It is a happy number.

12978042 is digitally balanced in base 2, base 4 and base 8, because in such bases 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 (33).

12978042 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 12977994 and 12978012.

It is not an unprimeable number, because it can be changed into a prime (12978047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1228 + ... + 5240.

It is an arithmetic number, because the mean of its divisors is an integer number (686394).

Almost surely, 2^12978042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12978042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16473456).

12978042 is an abundant number, since it is smaller than the sum of its proper divisors (19968870).

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

12978042 is a wasteful number, since it uses less digits than its factorization.

12978042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043 (or 4036 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 12978042 is about 3602.5049618286. The cubic root of 12978042 is about 235.0010079933.

It can be divided in two parts, 1297 and 8042, that added together give a palindrome (9339).

The spelling of 12978042 in words is "twelve million, nine hundred seventy-eight thousand, forty-two".