394808520 has 64 divisors (see below), whose sum is σ = 1190632320. Its totient is φ = 104730624.

The previous prime is 394808503. The next prime is 394808549. The reversal of 394808520 is 25808493.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14637 + ... + 31683.

It is an arithmetic number, because the mean of its divisors is an integer number (18603630).

Almost surely, 2^394808520 is an apocalyptic number.

394808520 is a gapful number since it is divisible by the number (30) 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 394808520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (595316160).

394808520 is an abundant number, since it is smaller than the sum of its proper divisors (795823800).

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

394808520 is a wasteful number, since it uses less digits than its factorization.

394808520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17254 (or 17250 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 394808520 is about 19869.7891282218. The cubic root of 394808520 is about 733.6048131681.

The spelling of 394808520 in words is "three hundred ninety-four million, eight hundred eight thousand, five hundred twenty".