393487216 has 60 divisors (see below), whose sum is σ = 797649096. Its totient is φ = 188023680.

The previous prime is 393487163. The next prime is 393487217. The reversal of 393487216 is 612784393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393487217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2413951 + ... + 2414113.

Almost surely, 2^393487216 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 393487216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398824548).

393487216 is an abundant number, since it is smaller than the sum of its proper divisors (404161880).

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

393487216 is a wasteful number, since it uses less digits than its factorization.

393487216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 353 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 393487216 is about 19836.5121934276. The cubic root of 393487216 is about 732.7855144667.

It can be divided in two parts, 39348 and 7216, that added together give a palindrome (46564).

The spelling of 393487216 in words is "three hundred ninety-three million, four hundred eighty-seven thousand, two hundred sixteen".