265398 has 32 divisors (see below), whose sum is σ = 622080. Its totient is φ = 73920.

The previous prime is 265381. The next prime is 265399. The reversal of 265398 is 893562.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265399) by changing a digit.

265398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2938 + ... + 3026.

It is an arithmetic number, because the mean of its divisors is an integer number (19440).

2²⁶⁵³⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311040).

265398 is an abundant number, since it is smaller than the sum of its proper divisors (356682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265398 is a wasteful number, since it uses less digits than its factorization.

265398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172.

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

The square root of 265398 is about 515.1679337847. The cubic root of 265398 is about 64.2637229894.

The spelling of 265398 in words is "two hundred sixty-five thousand, three hundred ninety-eight".