396278665 has 8 divisors (see below), whose sum is σ = 479006280. Its totient is φ = 314708352.

The previous prime is 396278647. The next prime is 396278671. The reversal of 396278665 is 566872693.

It can be written as a sum of positive squares in 4 ways, for example, as 18870336 + 377408329 = 4344^2 + 19427^2 .

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 396278665 - 2¹⁵ = 396245897 is a prime.

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, 288570 + ... + 289939.

It is an arithmetic number, because the mean of its divisors is an integer number (59875785).

Almost surely, 2^396278665 is an apocalyptic number.

It is an amenable number.

396278665 is a deficient number, since it is larger than the sum of its proper divisors (82727615).

396278665 is a wasteful number, since it uses less digits than its factorization.

396278665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578651.

The product of its digits is 3265920, while the sum is 52.

The square root of 396278665 is about 19906.7492323584. The cubic root of 396278665 is about 734.5142578586.

The spelling of 396278665 in words is "three hundred ninety-six million, two hundred seventy-eight thousand, six hundred sixty-five".