265389 has 4 divisors (see below), whose sum is σ = 353856. Its totient is φ = 176924.

The previous prime is 265381. The next prime is 265399. The reversal of 265389 is 983562.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 265389 - 2³ = 265381 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265381) 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, 44229 + ... + 44234.

It is an arithmetic number, because the mean of its divisors is an integer number (88464).

2²⁶⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

265389 is a deficient number, since it is larger than the sum of its proper divisors (88467).

265389 is an equidigital number, since it uses as much as digits as its factorization.

265389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88466.

The product of its digits is 12960, while the sum is 33.

The square root of 265389 is about 515.1591986949. The cubic root of 265389 is about 64.2629965583.

Subtracting from 265389 its sum of digits (33), we obtain a triangular number (265356 = T₇₂₈).

The spelling of 265389 in words is "two hundred sixty-five thousand, three hundred eighty-nine".