408918823 has 2 divisors, whose sum is σ = 408918824. Its totient is φ = 408918822.

The previous prime is 408918767. The next prime is 408918883. The reversal of 408918823 is 328819804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 408918823 - 2²¹ = 406821671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 408918823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408918883) 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, 204459411 + 204459412.

It is an arithmetic number, because the mean of its divisors is an integer number (204459412).

Almost surely, 2^408918823 is an apocalyptic number.

408918823 is a deficient number, since it is larger than the sum of its proper divisors (1).

408918823 is an equidigital number, since it uses as much as digits as its factorization.

408918823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 408918823 is about 20221.7413444045. The cubic root of 408918823 is about 742.2422995930.

The spelling of 408918823 in words is "four hundred eight million, nine hundred eighteen thousand, eight hundred twenty-three".