265421 has 8 divisors (see below), whose sum is σ = 302904. Its totient is φ = 230400.

The previous prime is 265417. The next prime is 265423. The reversal of 265421 is 124562.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 265225 = 14^2 + 515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 265421 - 2² = 265417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 265393 and 265402.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380 + ... + 821.

It is an arithmetic number, because the mean of its divisors is an integer number (37863).

2²⁶⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

265421 is a deficient number, since it is larger than the sum of its proper divisors (37483).

265421 is a wasteful number, since it uses less digits than its factorization.

265421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its digits is 480, while the sum is 20.

The square root of 265421 is about 515.1902561190. The cubic root of 265421 is about 64.2655793497.

Adding to 265421 its reverse (124562), we get a palindrome (389983).

It can be divided in two parts, 265 and 421, that added together give a palindrome (686).

The spelling of 265421 in words is "two hundred sixty-five thousand, four hundred twenty-one".