1263284840 has 16 divisors (see below), whose sum is σ = 2842390980. Its totient is φ = 505313920.

The previous prime is 1263284819. The next prime is 1263284843. The reversal of 1263284840 is 484823621.

It can be written as a sum of positive squares in 2 ways, for example, as 1263233764 + 51076 = 35542^2 + 226^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1263284794 and 1263284803.

It is not an unprimeable number, because it can be changed into a prime (1263284843) 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, 15791021 + ... + 15791100.

Almost surely, 2^1263284840 is an apocalyptic number.

1263284840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263284840 is an abundant number, since it is smaller than the sum of its proper divisors (1579106140).

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

1263284840 is a wasteful number, since it uses less digits than its factorization.

1263284840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31582132 (or 31582128 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 1263284840 is about 35542.7185229267. The cubic root of 1263284840 is about 1081.0200810205.

The spelling of 1263284840 in words is "one billion, two hundred sixty-three million, two hundred eighty-four thousand, eight hundred forty".