396404865 has 24 divisors (see below), whose sum is σ = 705675048. Its totient is φ = 205701120.

The previous prime is 396404837. The next prime is 396404867. The reversal of 396404865 is 568404693.

It can be written as a sum of positive squares in 4 ways, for example, as 57881664 + 338523201 = 7608^2 + 18399^2 .

It is not a de Polignac number, because 396404865 - 2⁷ = 396404737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 396404865.

It is not an unprimeable number, because it can be changed into a prime (396404867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117376 + ... + 120705.

It is an arithmetic number, because the mean of its divisors is an integer number (29403127).

Almost surely, 2^396404865 is an apocalyptic number.

It is an amenable number.

396404865 is a deficient number, since it is larger than the sum of its proper divisors (309270183).

396404865 is a wasteful number, since it uses less digits than its factorization.

396404865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238129 (or 238126 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 396404865 is about 19909.9187592516. The cubic root of 396404865 is about 734.5922213972.

The spelling of 396404865 in words is "three hundred ninety-six million, four hundred four thousand, eight hundred sixty-five".