12781205 has 24 divisors (see below), whose sum is σ = 16578072. Its totient is φ = 9455616.

The previous prime is 12781193. The next prime is 12781267. The reversal of 12781205 is 50218721.

12781205 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 1343281 + 11437924 = 1159^2 + 3382^2 .

It is not a de Polignac number, because 12781205 - 2⁸ = 12780949 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131717 + ... + 131813.

It is an arithmetic number, because the mean of its divisors is an integer number (690753).

Almost surely, 2^12781205 is an apocalyptic number.

It is an amenable number.

12781205 is a deficient number, since it is larger than the sum of its proper divisors (3796867).

12781205 is an equidigital number, since it uses as much as digits as its factorization.

12781205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12781205 is about 3575.0811179608. The cubic root of 12781205 is about 233.8068694025.

Adding to 12781205 its reverse (50218721), we get a palindrome (62999926).

The spelling of 12781205 in words is "twelve million, seven hundred eighty-one thousand, two hundred five".