12961845 has 24 divisors (see below), whose sum is σ = 24196536. Its totient is φ = 6380928.

The previous prime is 12961843. The next prime is 12961849. The reversal of 12961845 is 54816921.

12961845 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1306449 + 11655396 = 1143^2 + 3414^2 .

It is not a de Polignac number, because 12961845 - 2¹ = 12961843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12961841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10494 + ... + 11663.

It is an arithmetic number, because the mean of its divisors is an integer number (1008189).

Almost surely, 2^12961845 is an apocalyptic number.

12961845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12961845 is a deficient number, since it is larger than the sum of its proper divisors (11234691).

12961845 is a wasteful number, since it uses less digits than its factorization.

12961845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22181 (or 22178 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 12961845 is about 3600.2562408806. The cubic root of 12961845 is about 234.9032044394.

The spelling of 12961845 in words is "twelve million, nine hundred sixty-one thousand, eight hundred forty-five".