12781305 has 24 divisors (see below), whose sum is σ = 22239360. Its totient is φ = 6790560.

The previous prime is 12781303. The next prime is 12781313. The reversal of 12781305 is 50318721.

12781305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12781305 - 2¹ = 12781303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12781303) 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, 19066 + ... + 19724.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^12781305 is an apocalyptic number.

12781305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12781305 is a deficient number, since it is larger than the sum of its proper divisors (9458055).

12781305 is a wasteful number, since it uses less digits than its factorization.

12781305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1098 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12781305 is about 3575.0951036301. The cubic root of 12781305 is about 233.8074791683.

The spelling of 12781305 in words is "twelve million, seven hundred eighty-one thousand, three hundred five".