393888976 has 120 divisors (see below), whose sum is σ = 882991104. Its totient is φ = 169827840.

The previous prime is 393888923. The next prime is 393889037. The reversal of 393888976 is 679888393.

It is a super-3 number, since 3×393888976³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3101425 + ... + 3101551.

Almost surely, 2^393888976 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 393888976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441495552).

393888976 is an abundant number, since it is smaller than the sum of its proper divisors (489102128).

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

393888976 is a wasteful number, since it uses less digits than its factorization.

393888976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 210 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The square root of 393888976 is about 19846.6363900788. The cubic root of 393888976 is about 733.0348269012.

The spelling of 393888976 in words is "three hundred ninety-three million, eight hundred eighty-eight thousand, nine hundred seventy-six".