394019808 has 384 divisors, whose sum is σ = 1389975552. Its totient is φ = 94887936.

The previous prime is 394019803. The next prime is 394019819. The reversal of 394019808 is 808910493.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 394019808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394019803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7434310 + ... + 7434362.

It is an arithmetic number, because the mean of its divisors is an integer number (3619728).

Almost surely, 2^394019808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394019808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694987776).

394019808 is an abundant number, since it is smaller than the sum of its proper divisors (995955744).

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

394019808 is a wasteful number, since it uses less digits than its factorization.

394019808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 394019808 is about 19849.9321913199. The cubic root of 394019808 is about 733.1159781916.

The spelling of 394019808 in words is "three hundred ninety-four million, nineteen thousand, eight hundred eight".