409769 has 2 divisors, whose sum is σ = 409770. Its totient is φ = 409768.

The previous prime is 409753. The next prime is 409777. The reversal of 409769 is 967904.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 169 = 640^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 409769 - 2⁴ = 409753 is a prime.

It is a super-2 number, since 2×409769² = 335821266722, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (409709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204884 + 204885.

It is an arithmetic number, because the mean of its divisors is an integer number (204885).

2⁴⁰⁹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

409769 is a deficient number, since it is larger than the sum of its proper divisors (1).

409769 is an equidigital number, since it uses as much as digits as its factorization.

409769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 409769 is about 640.1320176339. The cubic root of 409769 is about 74.2756338463.

The spelling of 409769 in words is "four hundred nine thousand, seven hundred sixty-nine".