408801816 has 192 divisors, whose sum is σ = 1232824320. Its totient is φ = 126593280.

The previous prime is 408801797. The next prime is 408801829. The reversal of 408801816 is 618108804.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1833081 + ... + 1833303.

It is an arithmetic number, because the mean of its divisors is an integer number (6420960).

Almost surely, 2^408801816 is an apocalyptic number.

408801816 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 408801816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (616412160).

408801816 is an abundant number, since it is smaller than the sum of its proper divisors (824022504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

408801816 is a wasteful number, since it uses less digits than its factorization.

408801816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 408801816 is about 20218.8480384022. The cubic root of 408801816 is about 742.1714983935.

The spelling of 408801816 in words is "four hundred eight million, eight hundred one thousand, eight hundred sixteen".