116409 has 4 divisors (see below), whose sum is σ = 155216. Its totient is φ = 77604.

The previous prime is 116387. The next prime is 116411. The reversal of 116409 is 904611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 116409 - 2¹³ = 108217 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 116409.

It is not an unprimeable number, because it can be changed into a prime (116009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19399 + ... + 19404.

It is an arithmetic number, because the mean of its divisors is an integer number (38804).

2¹¹⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

116409 is a deficient number, since it is larger than the sum of its proper divisors (38807).

116409 is an equidigital number, since it uses as much as digits as its factorization.

116409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38806.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 116409 is about 341.1876316633. The cubic root of 116409 is about 48.8272411285.

It can be divided in two parts, 116 and 409, that added together give a palindrome (525).

The spelling of 116409 in words is "one hundred sixteen thousand, four hundred nine".