265997 has 4 divisors (see below), whose sum is σ = 267036. Its totient is φ = 264960.

The previous prime is 265987. The next prime is 266003. The reversal of 265997 is 799562.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 799562 = 2 ⋅399781.

It can be written as a sum of positive squares in 2 ways, for example, as 198916 + 67081 = 446^2 + 259^2 .

It is a cyclic number.

It is not a de Polignac number, because 265997 - 2¹⁶ = 200461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 265997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265957) 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, 173 + ... + 749.

It is an arithmetic number, because the mean of its divisors is an integer number (66759).

2²⁶⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

265997 is a deficient number, since it is larger than the sum of its proper divisors (1039).

265997 is an equidigital number, since it uses as much as digits as its factorization.

265997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038.

The product of its digits is 34020, while the sum is 38.

The square root of 265997 is about 515.7489699457. The cubic root of 265997 is about 64.3120341374.

The spelling of 265997 in words is "two hundred sixty-five thousand, nine hundred ninety-seven".