263974863 has 4 divisors (see below), whose sum is σ = 351966488. Its totient is φ = 175983240.

The previous prime is 263974859. The next prime is 263974891. The reversal of 263974863 is 368479362.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 263974863 - 2² = 263974859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263974813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43995808 + ... + 43995813.

It is an arithmetic number, because the mean of its divisors is an integer number (87991622).

Almost surely, 2^263974863 is an apocalyptic number.

263974863 is a deficient number, since it is larger than the sum of its proper divisors (87991625).

263974863 is an equidigital number, since it uses as much as digits as its factorization.

263974863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87991624.

The product of its digits is 1306368, while the sum is 48.

The square root of 263974863 is about 16247.3032531556. The cubic root of 263974863 is about 641.4865047998.

The spelling of 263974863 in words is "two hundred sixty-three million, nine hundred seventy-four thousand, eight hundred sixty-three".