265440 has 96 divisors (see below), whose sum is σ = 967680. Its totient is φ = 59904.

The previous prime is 265427. The next prime is 265451. The reversal of 265440 is 44562.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam 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, 3321 + ... + 3399.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2²⁶⁵⁴⁴⁰ is an apocalyptic number.

265440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483840).

265440 is an abundant number, since it is smaller than the sum of its proper divisors (702240).

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

265440 is a wasteful number, since it uses less digits than its factorization.

265440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 265440 is about 515.2086955788. The cubic root of 265440 is about 64.2671127838.

The spelling of 265440 in words is "two hundred sixty-five thousand, four hundred forty".