408815663 has 4 divisors (see below), whose sum is σ = 418323048. Its totient is φ = 399308280.

The previous prime is 408815653. The next prime is 408815681. The reversal of 408815663 is 366518804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 408815663 - 2¹² = 408811567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408815663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408815623) 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 in 3 ways as a sum of consecutive naturals, for example, 4753628 + ... + 4753713.

It is an arithmetic number, because the mean of its divisors is an integer number (104580762).

Almost surely, 2^408815663 is an apocalyptic number.

408815663 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

408815663 is a deficient number, since it is larger than the sum of its proper divisors (9507385).

408815663 is an equidigital number, since it uses as much as digits as its factorization.

408815663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9507384.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 408815663 is about 20219.1904635176. The cubic root of 408815663 is about 742.1798779491.

The spelling of 408815663 in words is "four hundred eight million, eight hundred fifteen thousand, six hundred sixty-three".