399684455565 has 8 divisors (see below), whose sum is σ = 639495128928. Its totient is φ = 213165042960.

The previous prime is 399684455561. The next prime is 399684455567. The reversal of 399684455565 is 565554486993.

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

It is not a de Polignac number, because 399684455565 - 2² = 399684455561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399684455565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399684455561) 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, 13322815171 + ... + 13322815200.

It is an arithmetic number, because the mean of its divisors is an integer number (79936891116).

Almost surely, 2^399684455565 is an apocalyptic number.

It is an amenable number.

399684455565 is a deficient number, since it is larger than the sum of its proper divisors (239810673363).

399684455565 is a wasteful number, since it uses less digits than its factorization.

399684455565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26645630379.

The product of its digits is 699840000, while the sum is 69.

The spelling of 399684455565 in words is "three hundred ninety-nine billion, six hundred eighty-four million, four hundred fifty-five thousand, five hundred sixty-five".