1263876321 has 8 divisors (see below), whose sum is σ = 1690588224. Its totient is φ = 839874320.

The previous prime is 1263876307. The next prime is 1263876323. The reversal of 1263876321 is 1236783621.

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

It is a cyclic number.

It is not a de Polignac number, because 1263876321 - 2⁷ = 1263876193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1263876321.

It is not an unprimeable number, because it can be changed into a prime (1263876323) 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, 676386 + ... + 678251.

It is an arithmetic number, because the mean of its divisors is an integer number (211323528).

Almost surely, 2^1263876321 is an apocalyptic number.

It is an amenable number.

1263876321 is a deficient number, since it is larger than the sum of its proper divisors (426711903).

1263876321 is a wasteful number, since it uses less digits than its factorization.

1263876321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354951.

The product of its digits is 72576, while the sum is 39.

The square root of 1263876321 is about 35551.0382548808. The cubic root of 1263876321 is about 1081.1887690453.

The spelling of 1263876321 in words is "one billion, two hundred sixty-three million, eight hundred seventy-six thousand, three hundred twenty-one".