406091 has 4 divisors (see below), whose sum is σ = 464112. Its totient is φ = 348072.

The previous prime is 406073. The next prime is 406093. The reversal of 406091 is 190604.

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

It is a cyclic number.

It is not a de Polignac number, because 406091 - 2⁶ = 406027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406093) 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, 29000 + ... + 29013.

It is an arithmetic number, because the mean of its divisors is an integer number (116028).

2⁴⁰⁶⁰⁹¹ is an apocalyptic number.

406091 is a deficient number, since it is larger than the sum of its proper divisors (58021).

406091 is an equidigital number, since it uses as much as digits as its factorization.

406091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58020.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 406091 is about 637.2526971304. The cubic root of 406091 is about 74.0527381545.

Adding to 406091 its reverse (190604), we get a palindrome (596695).

The spelling of 406091 in words is "four hundred six thousand, ninety-one".