406169 has 2 divisors, whose sum is σ = 406170. Its totient is φ = 406168.

The previous prime is 406123. The next prime is 406171. The reversal of 406169 is 961604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405769 + 400 = 637^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 406169 - 2¹⁶ = 340633 is a prime.

It is a super-2 number, since 2×406169² = 329946513122, which contains 22 as substring.

Together with 406171, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not a weakly prime, because it can be changed into another prime (406969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203084 + 203085.

It is an arithmetic number, because the mean of its divisors is an integer number (203085).

2⁴⁰⁶¹⁶⁹ is an apocalyptic number.

It is an amenable number.

406169 is a deficient number, since it is larger than the sum of its proper divisors (1).

406169 is an equidigital number, since it uses as much as digits as its factorization.

406169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 406169 is about 637.3138944037. The cubic root of 406169 is about 74.0574790818.

It can be divided in two parts, 406 and 169, that added together give a palindrome (575).

The spelling of 406169 in words is "four hundred six thousand, one hundred sixty-nine".