1263923856 has 60 divisors (see below), whose sum is σ = 3809331708. Its totient is φ = 388899072.

The previous prime is 1263923827. The next prime is 1263923861. The reversal of 1263923856 is 6583293621.

1263923856 is a `hidden beast` number, since 1 + 2 + 639 + 2 + 3 + 8 + 5 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 332697600 + 931226256 = 18240^2 + 30516^2 .

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, 335715 + ... + 339458.

Almost surely, 2^1263923856 is an apocalyptic number.

1263923856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1263923856 is an abundant number, since it is smaller than the sum of its proper divisors (2545407852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1263923856 is a wasteful number, since it uses less digits than its factorization.

1263923856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675200 (or 675191 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1263923856 is about 35551.7067944705. The cubic root of 1263923856 is about 1081.2023235530.

The spelling of 1263923856 in words is "one billion, two hundred sixty-three million, nine hundred twenty-three thousand, eight hundred fifty-six".