1263923864 has 16 divisors (see below), whose sum is σ = 2708408400. Its totient is φ = 541681632.

The previous prime is 1263923861. The next prime is 1263923893. The reversal of 1263923864 is 4683293621.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

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, 11284979 + ... + 11285090.

It is an arithmetic number, because the mean of its divisors is an integer number (169275525).

Almost surely, 2^1263923864 is an apocalyptic number.

1263923864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1263923864 is an abundant number, since it is smaller than the sum of its proper divisors (1444484536).

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

1263923864 is a wasteful number, since it uses less digits than its factorization.

1263923864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22570082 (or 22570078 counting only the distinct ones).

The product of its digits is 373248, while the sum is 44.

The square root of 1263923864 is about 35551.7069069827. The cubic root of 1263923864 is about 1081.2023258341.

The spelling of 1263923864 in words is "one billion, two hundred sixty-three million, nine hundred twenty-three thousand, eight hundred sixty-four".