394554816 has 84 divisors (see below), whose sum is σ = 1138384312. Its totient is φ = 130650624.

The previous prime is 394554803. The next prime is 394554827. The reversal of 394554816 is 618455493.

394554816 is a `hidden beast` number, since 3 + 94 + 5 + 548 + 16 = 666.

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 11 ways as a sum of consecutive naturals, for example, 88251 + ... + 92613.

Almost surely, 2^394554816 is an apocalyptic number.

394554816 is a gapful number since it is divisible by the number (36) 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 394554816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569192156).

394554816 is an abundant number, since it is smaller than the sum of its proper divisors (743829496).

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

394554816 is a wasteful number, since it uses less digits than its factorization.

394554816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538 (or 4525 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 394554816 is about 19863.4039378954. The cubic root of 394554816 is about 733.4476413182.

The spelling of 394554816 in words is "three hundred ninety-four million, five hundred fifty-four thousand, eight hundred sixteen".