394804820 has 12 divisors (see below), whose sum is σ = 829090164. Its totient is φ = 157921920.

The previous prime is 394804807. The next prime is 394804873. The reversal of 394804820 is 28408493.

It can be written as a sum of positive squares in 2 ways, for example, as 234579856 + 160224964 = 15316^2 + 12658^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9870101 + ... + 9870140.

It is an arithmetic number, because the mean of its divisors is an integer number (69090847).

Almost surely, 2^394804820 is an apocalyptic number.

It is an amenable number.

394804820 is an abundant number, since it is smaller than the sum of its proper divisors (434285344).

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

394804820 is a wasteful number, since it uses less digits than its factorization.

394804820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19740250 (or 19740248 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 394804820 is about 19869.6960218318. The cubic root of 394804820 is about 733.6025214696.

The spelling of 394804820 in words is "three hundred ninety-four million, eight hundred four thousand, eight hundred twenty".