393840078745 has 12 divisors (see below), whose sum is σ = 475801382700. Its totient is φ = 312957397184.

The previous prime is 393840078733. The next prime is 393840078767. The reversal of 393840078745 is 547870048393.

It can be written as a sum of positive squares in 6 ways, for example, as 186016239616 + 207823839129 = 431296^2 + 455877^2 .

It is not a de Polignac number, because 393840078745 - 2¹⁷ = 393839947673 is a prime.

It is a super-2 number, since 2×393840078745² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 393840078745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1662970 + ... + 1884979.

It is an arithmetic number, because the mean of its divisors is an integer number (39650115225).

Almost surely, 2^393840078745 is an apocalyptic number.

It is an amenable number.

393840078745 is a deficient number, since it is larger than the sum of its proper divisors (81961303955).

393840078745 is an equidigital number, since it uses as much as digits as its factorization.

393840078745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548252 (or 3548103 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 393840078745 in words is "three hundred ninety-three billion, eight hundred forty million, seventy-eight thousand, seven hundred forty-five".