12961278 has 48 divisors (see below), whose sum is σ = 30946032. Its totient is φ = 3920400.

The previous prime is 12961253. The next prime is 12961279. The reversal of 12961278 is 87216921.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961279) 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, 23688 + ... + 24228.

It is an arithmetic number, because the mean of its divisors is an integer number (644709).

Almost surely, 2^12961278 is an apocalyptic number.

12961278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12961278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15473016).

12961278 is an abundant number, since it is smaller than the sum of its proper divisors (17984754).

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

12961278 is a wasteful number, since it uses less digits than its factorization.

12961278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 557 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 12961278 is about 3600.1774956243. The cubic root of 12961278 is about 234.8997792053.

The spelling of 12961278 in words is "twelve million, nine hundred sixty-one thousand, two hundred seventy-eight".