408340817 has 2 divisors, whose sum is σ = 408340818. Its totient is φ = 408340816.

The previous prime is 408340787. The next prime is 408340831. The reversal of 408340817 is 718043804.

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., 406264336 + 2076481 = 20156^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 408340817 - 2²⁶ = 341231953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (408342817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204170408 + 204170409.

It is an arithmetic number, because the mean of its divisors is an integer number (204170409).

Almost surely, 2^408340817 is an apocalyptic number.

It is an amenable number.

408340817 is a deficient number, since it is larger than the sum of its proper divisors (1).

408340817 is an equidigital number, since it uses as much as digits as its factorization.

408340817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 408340817 is about 20207.4445935155. Note that the first 3 decimals coincide. The cubic root of 408340817 is about 741.8924153150.

The spelling of 408340817 in words is "four hundred eight million, three hundred forty thousand, eight hundred seventeen".