260409 has 8 divisors (see below), whose sum is σ = 353152. Its totient is φ = 170640.

The previous prime is 260399. The next prime is 260411. The reversal of 260409 is 904062.

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

It is not a de Polignac number, because 260409 - 2¹² = 256313 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260419) 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, 529 + ... + 894.

It is an arithmetic number, because the mean of its divisors is an integer number (44144).

2²⁶⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

260409 is a deficient number, since it is larger than the sum of its proper divisors (92743).

260409 is a wasteful number, since it uses less digits than its factorization.

260409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 260409 is about 510.3028512560. The cubic root of 260409 is about 63.8584926892.

The spelling of 260409 in words is "two hundred sixty thousand, four hundred nine".