394305408 has 192 divisors, whose sum is σ = 1345518720. Its totient is φ = 112596480.

The previous prime is 394305391. The next prime is 394305413. The reversal of 394305408 is 804503493.

It is a tau number, because it is divible by the number of its divisors (192).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216823 + ... + 218633.

It is an arithmetic number, because the mean of its divisors is an integer number (7007910).

Almost surely, 2^394305408 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 394305408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672759360).

394305408 is an abundant number, since it is smaller than the sum of its proper divisors (951213312).

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

394305408 is an equidigital number, since it uses as much as digits as its factorization.

394305408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847 (or 1823 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 394305408 is about 19857.1248674122. The cubic root of 394305408 is about 733.2930651902.

The spelling of 394305408 in words is "three hundred ninety-four million, three hundred five thousand, four hundred eight".