396042813 has 6 divisors (see below), whose sum is σ = 572061854. Its totient is φ = 264028536.

The previous prime is 396042811. The next prime is 396042847. The reversal of 396042813 is 318240693.

396042813 is a `hidden beast` number, since 39 + 604 + 2 + 8 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 395731449 + 311364 = 19893^2 + 558^2 .

It is not a de Polignac number, because 396042813 - 2¹ = 396042811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (396042811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22002370 + ... + 22002387.

Almost surely, 2^396042813 is an apocalyptic number.

It is an amenable number.

396042813 is a deficient number, since it is larger than the sum of its proper divisors (176019041).

396042813 is a wasteful number, since it uses less digits than its factorization.

396042813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44004763 (or 44004760 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 396042813 is about 19900.8244301587. The cubic root of 396042813 is about 734.3685093810.

The spelling of 396042813 in words is "three hundred ninety-six million, forty-two thousand, eight hundred thirteen".