1263878499 has 24 divisors (see below), whose sum is σ = 1920826560. Its totient is φ = 736830432.

The previous prime is 1263878491. The next prime is 1263878503. The reversal of 1263878499 is 9948783621.

It is not a de Polignac number, because 1263878499 - 2³ = 1263878491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (1263878491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55969 + ... + 75234.

It is an arithmetic number, because the mean of its divisors is an integer number (80034440).

Almost surely, 2^1263878499 is an apocalyptic number.

1263878499 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1263878499 is a deficient number, since it is larger than the sum of its proper divisors (656948061).

1263878499 is a wasteful number, since it uses less digits than its factorization.

1263878499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131251 (or 131238 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The square root of 1263878499 is about 35551.0688868844. The cubic root of 1263878499 is about 1081.1893901050.

The spelling of 1263878499 in words is "one billion, two hundred sixty-three million, eight hundred seventy-eight thousand, four hundred ninety-nine".