396865405 has 8 divisors (see below), whose sum is σ = 478283832. Its totient is φ = 316128768.

The previous prime is 396865393. The next prime is 396865409. The reversal of 396865405 is 504568693.

It can be written as a sum of positive squares in 4 ways, for example, as 8696601 + 388168804 = 2949^2 + 19702^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 396865405 - 2¹⁹ = 396341117 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 (396865409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169164 + ... + 171493.

It is an arithmetic number, because the mean of its divisors is an integer number (59785479).

Almost surely, 2^396865405 is an apocalyptic number.

It is an amenable number.

396865405 is a deficient number, since it is larger than the sum of its proper divisors (81418427).

396865405 is a wasteful number, since it uses less digits than its factorization.

396865405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340895.

The product of its (nonzero) digits is 777600, while the sum is 46.

The square root of 396865405 is about 19921.4809941430. The cubic root of 396865405 is about 734.8765924204.

The spelling of 396865405 in words is "three hundred ninety-six million, eight hundred sixty-five thousand, four hundred five".