265420 has 24 divisors (see below), whose sum is σ = 582624. Its totient is φ = 101376.

The previous prime is 265417. The next prime is 265423. The reversal of 265420 is 24562.

It is an interprime number because it is at equal distance from previous prime (265417) and next prime (265423).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (265423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 748.

It is an arithmetic number, because the mean of its divisors is an integer number (24276).

2²⁶⁵⁴²⁰ is an apocalyptic number.

265420 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 265420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291312).

265420 is an abundant number, since it is smaller than the sum of its proper divisors (317204).

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

265420 is a wasteful number, since it uses less digits than its factorization.

265420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 265420 is about 515.1892856029. The cubic root of 265420 is about 64.2654986406.

Adding to 265420 its reverse (24562), we get a palindrome (289982).

The spelling of 265420 in words is "two hundred sixty-five thousand, four hundred twenty".