394493904 has 180 divisors, whose sum is σ = 1295931936. Its totient is φ = 112021056.

The previous prime is 394493881. The next prime is 394493909. The reversal of 394493904 is 409394493.

It is a super-2 number, since 2×394493904² = 311250880586322432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394493904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394493909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2420127 + ... + 2420289.

Almost surely, 2^394493904 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 394493904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647965968).

394493904 is an abundant number, since it is smaller than the sum of its proper divisors (901438032).

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

394493904 is an equidigital number, since it uses as much as digits as its factorization.

394493904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 394493904 is about 19861.8706067681. The cubic root of 394493904 is about 733.4098957713.

The spelling of 394493904 in words is "three hundred ninety-four million, four hundred ninety-three thousand, nine hundred four".