393487545784393 has 4 divisors (see below), whose sum is σ = 393487585744788. Its totient is φ = 393487505824000.

The previous prime is 393487545784349. The next prime is 393487545784423.

393487545784393 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 984762491904 + 392502783292489 = 992352^2 + 19811683^2 .

It is a cyclic number.

It is not a de Polignac number, because 393487545784393 - 2²¹ = 393487543687241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393487545724393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402393 + ... + 28774393.

It is an arithmetic number, because the mean of its divisors is an integer number (98371896436197).

Almost surely, 2^{393487545784393} is an apocalyptic number.

It is an amenable number.

393487545784393 is a deficient number, since it is larger than the sum of its proper divisors (39960395).

393487545784393 is a wasteful number, since it uses less digits than its factorization.

393487545784393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39960394.

The product of its digits is 32920473600, while the sum is 82.

The spelling of 393487545784393 in words is "three hundred ninety-three trillion, four hundred eighty-seven billion, five hundred forty-five million, seven hundred eighty-four thousand, three hundred ninety-three".