393228665 has 4 divisors (see below), whose sum is σ = 471874404. Its totient is φ = 314582928.

The previous prime is 393228659. The next prime is 393228691. The reversal of 393228665 is 566822393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566822393 = 79 ⋅7174967.

It can be written as a sum of positive squares in 2 ways, for example, as 77668969 + 315559696 = 8813^2 + 17764^2 .

It is a cyclic number.

It is not a de Polignac number, because 393228665 - 2¹⁸ = 392966521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39322862 + ... + 39322871.

It is an arithmetic number, because the mean of its divisors is an integer number (117968601).

Almost surely, 2^393228665 is an apocalyptic number.

It is an amenable number.

393228665 is a deficient number, since it is larger than the sum of its proper divisors (78645739).

393228665 is an equidigital number, since it uses as much as digits as its factorization.

393228665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78645738.

The product of its digits is 466560, while the sum is 44.

The square root of 393228665 is about 19829.9940746335. The cubic root of 393228665 is about 732.6249807128.

The spelling of 393228665 in words is "three hundred ninety-three million, two hundred twenty-eight thousand, six hundred sixty-five".