265979 has 4 divisors (see below), whose sum is σ = 303984. Its totient is φ = 227976.

The previous prime is 265961. The next prime is 265987. The reversal of 265979 is 979562.

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

It is not a de Polignac number, because 265979 - 2¹⁶ = 200443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18992 + ... + 19005.

It is an arithmetic number, because the mean of its divisors is an integer number (75996).

2²⁶⁵⁹⁷⁹ is an apocalyptic number.

265979 is a deficient number, since it is larger than the sum of its proper divisors (38005).

265979 is an equidigital number, since it uses as much as digits as its factorization.

265979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38004.

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

The square root of 265979 is about 515.7315193005. The cubic root of 265979 is about 64.3105834409.

The spelling of 265979 in words is "two hundred sixty-five thousand, nine hundred seventy-nine".