1263923871 has 96 divisors (see below), whose sum is σ = 2195074560. Its totient is φ = 631701504.

The previous prime is 1263923861. The next prime is 1263923893. The reversal of 1263923871 is 1783293621.

It is not a de Polignac number, because 1263923871 - 2¹⁴ = 1263907487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263923861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11185111 + ... + 11185223.

It is an arithmetic number, because the mean of its divisors is an integer number (22865360).

Almost surely, 2^1263923871 is an apocalyptic number.

1263923871 is a deficient number, since it is larger than the sum of its proper divisors (931150689).

1263923871 is a wasteful number, since it uses less digits than its factorization.

1263923871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 256 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 1263923871 is about 35551.7070054308. The cubic root of 1263923871 is about 1081.2023278301.

The spelling of 1263923871 in words is "one billion, two hundred sixty-three million, nine hundred twenty-three thousand, eight hundred seventy-one".