1267138285 has 12 divisors (see below), whose sum is σ = 1768821948. Its totient is φ = 868894656.

The previous prime is 1267138261. The next prime is 1267138321. The reversal of 1267138285 is 5828317621.

1267138285 is digitally balanced in base 6, 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 2 ways, for example, as 859017481 + 408120804 = 29309^2 + 20202^2 .

It is not a de Polignac number, because 1267138285 - 2⁷ = 1267138157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2585752 + ... + 2586241.

It is an arithmetic number, because the mean of its divisors is an integer number (147401829).

Almost surely, 2^1267138285 is an apocalyptic number.

It is an amenable number.

1267138285 is a deficient number, since it is larger than the sum of its proper divisors (501683663).

1267138285 is an equidigital number, since it uses as much as digits as its factorization.

1267138285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5172012 (or 5172005 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 1267138285 is about 35596.8858890774. The cubic root of 1267138285 is about 1082.1181239717.

The spelling of 1267138285 in words is "one billion, two hundred sixty-seven million, one hundred thirty-eight thousand, two hundred eighty-five".