263798965 has 16 divisors (see below), whose sum is σ = 321205248. Its totient is φ = 207962496.

The previous prime is 263798947. The next prime is 263798981. The reversal of 263798965 is 569897362.

263798965 is a nontrivial binomial coefficient, being equal to C(22970, 2).

It is a cyclic number.

It is not a de Polignac number, because 263798965 - 2⁷ = 263798837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113697 + ... + 115993.

It is an arithmetic number, because the mean of its divisors is an integer number (20075328).

Almost surely, 2^263798965 is an apocalyptic number.

263798965 is the 22969-th triangular number and also the 11485-th hexagonal number.

263798965 is the 7657-th centered nonagonal number.

It is an amenable number.

263798965 is a deficient number, since it is larger than the sum of its proper divisors (57406283).

263798965 is a wasteful number, since it uses less digits than its factorization.

263798965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628.

The product of its digits is 4898880, while the sum is 55.

The square root of 263798965 is about 16241.8892066163. The cubic root of 263798965 is about 641.3439896328.

It can be divided in two parts, 26379 and 8965, that added together give a square (35344 = 188²).

The spelling of 263798965 in words is "two hundred sixty-three million, seven hundred ninety-eight thousand, nine hundred sixty-five".