393982654469 has 2 divisors, whose sum is σ = 393982654470. Its totient is φ = 393982654468.

The previous prime is 393982654451. The next prime is 393982654493. The reversal of 393982654469 is 964456289393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221789193025 + 172193461444 = 470945^2 + 414962^2 .

It is a cyclic number.

It is not a de Polignac number, because 393982654469 - 2⁸ = 393982654213 is a prime.

It is a super-2 number, since 2×393982654469² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 393982654399 and 393982654408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393922654469) 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 as a sum of consecutive naturals, namely, 196991327234 + 196991327235.

It is an arithmetic number, because the mean of its divisors is an integer number (196991327235).

Almost surely, 2^393982654469 is an apocalyptic number.

It is an amenable number.

393982654469 is a deficient number, since it is larger than the sum of its proper divisors (1).

393982654469 is an equidigital number, since it uses as much as digits as its factorization.

393982654469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302330880, while the sum is 68.

The spelling of 393982654469 in words is "three hundred ninety-three billion, nine hundred eighty-two million, six hundred fifty-four thousand, four hundred sixty-nine".