396781216 has 48 divisors (see below), whose sum is σ = 850011624. Its totient is φ = 181223424.

The previous prime is 396781163. The next prime is 396781223. The reversal of 396781216 is 612187693.

It can be written as a sum of positive squares in 4 ways, for example, as 269091216 + 127690000 = 16404^2 + 11300^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35436 + ... + 45268.

Almost surely, 2^396781216 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 396781216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (425005812).

396781216 is an abundant number, since it is smaller than the sum of its proper divisors (453230408).

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

396781216 is a wasteful number, since it uses less digits than its factorization.

396781216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9953 (or 9945 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 396781216 is about 19919.3678614558. The cubic root of 396781216 is about 734.8246244232.

The spelling of 396781216 in words is "three hundred ninety-six million, seven hundred eighty-one thousand, two hundred sixteen".