1263923863 has 4 divisors (see below), whose sum is σ = 1264111648. Its totient is φ = 1263736080.

The previous prime is 1263923861. The next prime is 1263923893. The reversal of 1263923863 is 3683293621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1263923863 - 2¹ = 1263923861 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83406 + ... + 97387.

It is an arithmetic number, because the mean of its divisors is an integer number (316027912).

Almost surely, 2^1263923863 is an apocalyptic number.

1263923863 is a deficient number, since it is larger than the sum of its proper divisors (187785).

1263923863 is an equidigital number, since it uses as much as digits as its factorization.

1263923863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187784.

The product of its digits is 279936, while the sum is 43.

The square root of 1263923863 is about 35551.7068929187. The cubic root of 1263923863 is about 1081.2023255490.

The spelling of 1263923863 in words is "one billion, two hundred sixty-three million, nine hundred twenty-three thousand, eight hundred sixty-three".