408788813 has 2 divisors, whose sum is σ = 408788814. Its totient is φ = 408788812.

The previous prime is 408788791. The next prime is 408788833. The reversal of 408788813 is 318887804.

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., 226592809 + 182196004 = 15053^2 + 13498^2 .

It is a cyclic number.

It is not a de Polignac number, because 408788813 - 2¹⁰ = 408787789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408788833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204394406 + 204394407.

It is an arithmetic number, because the mean of its divisors is an integer number (204394407).

Almost surely, 2^408788813 is an apocalyptic number.

It is an amenable number.

408788813 is a deficient number, since it is larger than the sum of its proper divisors (1).

408788813 is an equidigital number, since it uses as much as digits as its factorization.

408788813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 344064, while the sum is 47.

The square root of 408788813 is about 20218.5264794445. The cubic root of 408788813 is about 742.1636294148.

The spelling of 408788813 in words is "four hundred eight million, seven hundred eighty-eight thousand, eight hundred thirteen".