11605 has 8 divisors (see below), whose sum is σ = 15264. Its totient is φ = 8400.

The previous prime is 11597. The next prime is 11617. The reversal of 11605 is 50611.

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

It is not a de Polignac number, because 11605 - 2³ = 11597 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 7 and base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 160.

It is an arithmetic number, because the mean of its divisors is an integer number (1908).

2¹¹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

11605 is a deficient number, since it is larger than the sum of its proper divisors (3659).

11605 is a wasteful number, since it uses less digits than its factorization.

11605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 11605 is about 107.7265055592. The cubic root of 11605 is about 22.6402758980.

It can be divided in two parts, 11 and 605, that added together give a palindrome (616).

The spelling of 11605 in words is "eleven thousand, six hundred five".