408221857 has 8 divisors (see below), whose sum is σ = 425484800. Its totient is φ = 391214880.

The previous prime is 408221839. The next prime is 408221873. The reversal of 408221857 is 758122804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 408221857 - 2¹¹ = 408219809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408221057) 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 7 ways as a sum of consecutive naturals, for example, 60732 + ... + 67117.

It is an arithmetic number, because the mean of its divisors is an integer number (53185600).

Almost surely, 2^408221857 is an apocalyptic number.

It is an amenable number.

408221857 is a deficient number, since it is larger than the sum of its proper divisors (17262943).

408221857 is a wasteful number, since it uses less digits than its factorization.

408221857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127983.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 408221857 is about 20204.5009094508. The cubic root of 408221857 is about 741.8203643143.

The spelling of 408221857 in words is "four hundred eight million, two hundred twenty-one thousand, eight hundred fifty-seven".