1263899216 has 20 divisors (see below), whose sum is σ = 2453126100. Its totient is φ = 630834432.

The previous prime is 1263899213. The next prime is 1263899227. The reversal of 1263899216 is 6129983621.

It can be written as a sum of positive squares in 2 ways, for example, as 302899216 + 961000000 = 17404^2 + 31000^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263899213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60311 + ... + 78518.

It is an arithmetic number, because the mean of its divisors is an integer number (122656305).

Almost surely, 2^1263899216 is an apocalyptic number.

1263899216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1263899216 is a deficient number, since it is larger than the sum of its proper divisors (1189226884).

1263899216 is a wasteful number, since it uses less digits than its factorization.

1263899216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139406 (or 139400 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 1263899216 is about 35551.3602552701. The cubic root of 1263899216 is about 1081.1952975500.

The spelling of 1263899216 in words is "one billion, two hundred sixty-three million, eight hundred ninety-nine thousand, two hundred sixteen".