1263427187 has 6 divisors (see below), whose sum is σ = 1388725884. Its totient is φ = 1148570060.

The previous prime is 1263427169. The next prime is 1263427189. The reversal of 1263427187 is 7817243621.

It is a de Polignac number, because none of the positive numbers 2^k-1263427187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263427189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5220653 + ... + 5220894.

It is an arithmetic number, because the mean of its divisors is an integer number (231454314).

Almost surely, 2^1263427187 is an apocalyptic number.

1263427187 is a deficient number, since it is larger than the sum of its proper divisors (125298697).

1263427187 is a wasteful number, since it uses less digits than its factorization.

1263427187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10441569 (or 10441558 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 1263427187 is about 35544.7209441852. The cubic root of 1263427187 is about 1081.0606826281.

The spelling of 1263427187 in words is "one billion, two hundred sixty-three million, four hundred twenty-seven thousand, one hundred eighty-seven".