399947362217 has 8 divisors (see below), whose sum is σ = 431508693000. Its totient is φ = 368499767040.

The previous prime is 399947362193. The next prime is 399947362223. The reversal of 399947362217 is 712263749993.

It can be written as a sum of positive squares in 4 ways, for example, as 68843789161 + 331103573056 = 262381^2 + 575416^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 399947362217 - 2⁶ = 399947362153 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 399947362217.

It is not an unprimeable number, because it can be changed into a prime (399947362417) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28426592 + ... + 28440657.

It is an arithmetic number, because the mean of its divisors is an integer number (53938586625).

Almost surely, 2^399947362217 is an apocalyptic number.

It is an amenable number.

399947362217 is a deficient number, since it is larger than the sum of its proper divisors (31561330783).

399947362217 is a wasteful number, since it uses less digits than its factorization.

399947362217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56867803.

The product of its digits is 30862944, while the sum is 62.

The spelling of 399947362217 in words is "three hundred ninety-nine billion, nine hundred forty-seven million, three hundred sixty-two thousand, two hundred seventeen".