393487808 has 56 divisors (see below), whose sum is σ = 897709152. Its totient is φ = 167629824.

The previous prime is 393487789. The next prime is 393487813. The reversal of 393487808 is 808784393.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74966 + ... + 80042.

Almost surely, 2^393487808 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 393487808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (448854576).

393487808 is an abundant number, since it is smaller than the sum of its proper divisors (504221344).

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

393487808 is a wasteful number, since it uses less digits than its factorization.

393487808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269 (or 5259 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 393487808 is about 19836.5271154000. The cubic root of 393487808 is about 732.7858819576.

The spelling of 393487808 in words is "three hundred ninety-three million, four hundred eighty-seven thousand, eight hundred eight".