1263965976 has 384 divisors, whose sum is σ = 4472832000. Its totient is φ = 320060160.

The previous prime is 1263965959. The next prime is 1263965977. The reversal of 1263965976 is 6795693621.

1263965976 is a `hidden beast` number, since 12 + 6 + 39 + 6 + 597 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263965977) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9952425 + ... + 9952551.

It is an arithmetic number, because the mean of its divisors is an integer number (11648000).

Almost surely, 2^1263965976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263965976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236416000).

1263965976 is an abundant number, since it is smaller than the sum of its proper divisors (3208866024).

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

1263965976 is a wasteful number, since it uses less digits than its factorization.

1263965976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 183 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 1263965976 is about 35552.2991661580. The cubic root of 1263965976 is about 1081.2143337005.

The spelling of 1263965976 in words is "one billion, two hundred sixty-three million, nine hundred sixty-five thousand, nine hundred seventy-six".