394555904 has 40 divisors (see below), whose sum is σ = 815556060. Its totient is φ = 190468096.

The previous prime is 394555897. The next prime is 394555921. The reversal of 394555904 is 409555493.

It can be written as a sum of positive squares in 2 ways, for example, as 336795904 + 57760000 = 18352^2 + 7600^2 .

It is a super-2 number, since 2×394555904² = 311348722762514432, which contains 22 as substring.

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, 1562 + ... + 28134.

Almost surely, 2^394555904 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 394555904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (407778030).

394555904 is an abundant number, since it is smaller than the sum of its proper divisors (421000156).

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

394555904 is an equidigital number, since it uses as much as digits as its factorization.

394555904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26620 (or 26604 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 44.

The square root of 394555904 is about 19863.4313249247. The cubic root of 394555904 is about 733.4483154876.

The spelling of 394555904 in words is "three hundred ninety-four million, five hundred fifty-five thousand, nine hundred four".