1263905873 has 4 divisors (see below), whose sum is σ = 1265174580. Its totient is φ = 1262637168.

The previous prime is 1263905857. The next prime is 1263905879. The reversal of 1263905873 is 3785093621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3785093621 = 233 ⋅16245037.

It can be written as a sum of positive squares in 2 ways, for example, as 990235024 + 273670849 = 31468^2 + 16543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263905873 - 2⁴ = 1263905857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263905879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632858 + ... + 634851.

It is an arithmetic number, because the mean of its divisors is an integer number (316293645).

Almost surely, 2^1263905873 is an apocalyptic number.

It is an amenable number.

1263905873 is a deficient number, since it is larger than the sum of its proper divisors (1268707).

1263905873 is an equidigital number, since it uses as much as digits as its factorization.

1263905873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268706.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 1263905873 is about 35551.4538802564. The cubic root of 1263905873 is about 1081.1971957774.

The spelling of 1263905873 in words is "one billion, two hundred sixty-three million, nine hundred five thousand, eight hundred seventy-three".