393343779865 has 8 divisors (see below), whose sum is σ = 472022513928. Its totient is φ = 314668371840.

The previous prime is 393343779841. The next prime is 393343779869. The reversal of 393343779865 is 568977343393.

It can be written as a sum of positive squares in 4 ways, for example, as 41669873424 + 351673906441 = 204132^2 + 593021^2 .

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

It is not a de Polignac number, because 393343779865 - 2²³ = 393335391257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393343779865.

It is not an unprimeable number, because it can be changed into a prime (393343779869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563476 + ... + 1050805.

It is an arithmetic number, because the mean of its divisors is an integer number (59002814241).

Almost surely, 2^393343779865 is an apocalyptic number.

It is an amenable number.

393343779865 is a deficient number, since it is larger than the sum of its proper divisors (78678734063).

393343779865 is a wasteful number, since it uses less digits than its factorization.

393343779865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663019.

The product of its digits is 308629440, while the sum is 67.

The spelling of 393343779865 in words is "three hundred ninety-three billion, three hundred forty-three million, seven hundred seventy-nine thousand, eight hundred sixty-five".