408221778 has 16 divisors (see below), whose sum is σ = 816645600. Its totient is φ = 136040256.

The previous prime is 408221773. The next prime is 408221809. The reversal of 408221778 is 877122804.

It is not an unprimeable number, because it can be changed into a prime (408221771) 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, 35373 + ... + 45471.

It is an arithmetic number, because the mean of its divisors is an integer number (51040350).

Almost surely, 2^408221778 is an apocalyptic number.

408221778 is an abundant number, since it is smaller than the sum of its proper divisors (408423822).

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

408221778 is a wasteful number, since it uses less digits than its factorization.

408221778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16841.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 408221778 is about 20204.4989544408. The cubic root of 408221778 is about 741.8203164614.

The spelling of 408221778 in words is "four hundred eight million, two hundred twenty-one thousand, seven hundred seventy-eight".