1263965984 has 12 divisors (see below), whose sum is σ = 2488433094. Its totient is φ = 631982976.

The previous prime is 1263965977. The next prime is 1263966001. The reversal of 1263965984 is 4895693621.

It can be written as a sum of positive squares in only one way, i.e., 1246090000 + 17875984 = 35300^2 + 4228^2 .

It is a super-2 number, since 2×1263965984² = 3195220017418176512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19749437 + ... + 19749500.

Almost surely, 2^1263965984 is an apocalyptic number.

It is an amenable number.

1263965984 is a deficient number, since it is larger than the sum of its proper divisors (1224467110).

1263965984 is an equidigital number, since it uses as much as digits as its factorization.

1263965984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39498947 (or 39498939 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 53.

The square root of 1263965984 is about 35552.2992786683. The cubic root of 1263965984 is about 1081.2143359816.

The spelling of 1263965984 in words is "one billion, two hundred sixty-three million, nine hundred sixty-five thousand, nine hundred eighty-four".