406165 has 4 divisors (see below), whose sum is σ = 487404. Its totient is φ = 324928.

The previous prime is 406123. The next prime is 406169. The reversal of 406165 is 561604.

406165 = T₂₈₀ + T₂₈₁ + ... + T₂₈₉.

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

It can be written as a sum of positive squares in 2 ways, for example, as 192721 + 213444 = 439^2 + 462^2 .

It is a cyclic number.

It is not a de Polignac number, because 406165 - 2⁷ = 406037 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406169) 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, 40612 + ... + 40621.

It is an arithmetic number, because the mean of its divisors is an integer number (121851).

2⁴⁰⁶¹⁶⁵ is an apocalyptic number.

It is an amenable number.

406165 is a deficient number, since it is larger than the sum of its proper divisors (81239).

406165 is an equidigital number, since it uses as much as digits as its factorization.

406165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81238.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 406165 is about 637.3107562249. The cubic root of 406165 is about 74.0572359721.

Adding to 406165 its reverse (561604), we get a palindrome (967769).

The spelling of 406165 in words is "four hundred six thousand, one hundred sixty-five".