396666816 has 224 divisors, whose sum is σ = 1313614848. Its totient is φ = 102850560.

The previous prime is 396666811. The next prime is 396666817. The reversal of 396666816 is 618666693.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396666811) 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, 1275301 + ... + 1275611.

It is an arithmetic number, because the mean of its divisors is an integer number (5864352).

Almost surely, 2^396666816 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 396666816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656807424).

396666816 is an abundant number, since it is smaller than the sum of its proper divisors (916948032).

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

396666816 is a wasteful number, since it uses less digits than its factorization.

396666816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 409 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 51.

The square root of 396666816 is about 19916.4960773726. The cubic root of 396666816 is about 734.7539960651.

The spelling of 396666816 in words is "three hundred ninety-six million, six hundred sixty-six thousand, eight hundred sixteen".