115405 has 4 divisors (see below), whose sum is σ = 138492. Its totient is φ = 92320.

The previous prime is 115399. The next prime is 115421. The reversal of 115405 is 504511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504511 = 7 ⋅72073.

It can be written as a sum of positive squares in 2 ways, for example, as 48841 + 66564 = 221^2 + 258^2 .

It is not a de Polignac number, because 115405 - 2¹¹ = 113357 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, 11536 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (34623).

2¹¹⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

115405 is a deficient number, since it is larger than the sum of its proper divisors (23087).

115405 is an equidigital number, since it uses as much as digits as its factorization.

115405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23086.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 115405 is about 339.7131142597. The cubic root of 115405 is about 48.6864611623.

Adding to 115405 its reverse (504511), we get a palindrome (619916).

The spelling of 115405 in words is "one hundred fifteen thousand, four hundred five".