1263438799 has 8 divisors (see below), whose sum is σ = 1455300608. Its totient is φ = 1074419640.

The previous prime is 1263438791. The next prime is 1263438811. The reversal of 1263438799 is 9978343621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1263438799 - 2³ = 1263438791 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 (1263438791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709707 + ... + 711484.

It is an arithmetic number, because the mean of its divisors is an integer number (181912576).

Almost surely, 2^1263438799 is an apocalyptic number.

1263438799 is a deficient number, since it is larger than the sum of its proper divisors (191861809).

1263438799 is a wasteful number, since it uses less digits than its factorization.

1263438799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421325.

The product of its digits is 1959552, while the sum is 52.

The square root of 1263438799 is about 35544.8842873345. The cubic root of 1263438799 is about 1081.0639945821.

The spelling of 1263438799 in words is "one billion, two hundred sixty-three million, four hundred thirty-eight thousand, seven hundred ninety-nine".