260405 has 4 divisors (see below), whose sum is σ = 312492. Its totient is φ = 208320.

The previous prime is 260399. The next prime is 260411. The reversal of 260405 is 504062.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (260399) and next prime (260411).

It can be written as a sum of positive squares in 2 ways, for example, as 54289 + 206116 = 233^2 + 454^2 .

It is not a de Polignac number, because 260405 - 2¹⁰ = 259381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26036 + ... + 26045.

It is an arithmetic number, because the mean of its divisors is an integer number (78123).

2²⁶⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

260405 is a deficient number, since it is larger than the sum of its proper divisors (52087).

260405 is an equidigital number, since it uses as much as digits as its factorization.

260405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52086.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 260405 is about 510.2989319997. The cubic root of 260405 is about 63.8581657224.

Adding to 260405 its reverse (504062), we get a palindrome (764467).

The spelling of 260405 in words is "two hundred sixty thousand, four hundred five".