409897 has 2 divisors, whose sum is σ = 409898. Its totient is φ = 409896.

The previous prime is 409891. The next prime is 409901. The reversal of 409897 is 798904.

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., 266256 + 143641 = 516^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 409897 - 2³ = 409889 is a prime.

It is not a weakly prime, because it can be changed into another prime (409891) 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, 204948 + 204949.

It is an arithmetic number, because the mean of its divisors is an integer number (204949).

2⁴⁰⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

409897 is a deficient number, since it is larger than the sum of its proper divisors (1).

409897 is an equidigital number, since it uses as much as digits as its factorization.

409897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 409897 is about 640.2319892039. The cubic root of 409897 is about 74.2833668954.

The spelling of 409897 in words is "four hundred nine thousand, eight hundred ninety-seven".