399382218 has 64 divisors (see below), whose sum is σ = 931115520. Its totient is φ = 126743616.

The previous prime is 399382199. The next prime is 399382219. The reversal of 399382218 is 812283993.

399382218 is a `hidden beast` number, since 399 + 38 + 221 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (399382219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91780 + ... + 96032.

It is an arithmetic number, because the mean of its divisors is an integer number (14548680).

Almost surely, 2^399382218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399382218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (465557760).

399382218 is an abundant number, since it is smaller than the sum of its proper divisors (531733302).

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

399382218 is a wasteful number, since it uses less digits than its factorization.

399382218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348 (or 4342 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 399382218 is about 19984.5494820374. The cubic root of 399382218 is about 736.4267828875.

The spelling of 399382218 in words is "three hundred ninety-nine million, three hundred eighty-two thousand, two hundred eighteen".