394404256 has 48 divisors (see below), whose sum is σ = 814036608. Its totient is φ = 187891200.

The previous prime is 394404193. The next prime is 394404259. The reversal of 394404256 is 652404493.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (394404259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52921 + ... + 59911.

It is an arithmetic number, because the mean of its divisors is an integer number (16959096).

Almost surely, 2^394404256 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 394404256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407018304).

394404256 is an abundant number, since it is smaller than the sum of its proper divisors (419632352).

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

394404256 is a wasteful number, since it uses less digits than its factorization.

394404256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7085 (or 7077 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 394404256 is about 19859.6136921140. The cubic root of 394404256 is about 733.3543362212.

The spelling of 394404256 in words is "three hundred ninety-four million, four hundred four thousand, two hundred fifty-six".