685966349 has 8 divisors (see below), whose sum is σ = 691215000. Its totient is φ = 680726592.

The previous prime is 685966339. The next prime is 685966381. The reversal of 685966349 is 943669586.

It can be written as a sum of positive squares in 4 ways, for example, as 36990724 + 648975625 = 6082^2 + 25475^2 .

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 685966349 - 2¹² = 685962253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 685966294 and 685966303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685966339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301187 + ... + 303455.

It is an arithmetic number, because the mean of its divisors is an integer number (86401875).

Almost surely, 2^685966349 is an apocalyptic number.

It is an amenable number.

685966349 is a deficient number, since it is larger than the sum of its proper divisors (5248651).

685966349 is a wasteful number, since it uses less digits than its factorization.

685966349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447.

The product of its digits is 8398080, while the sum is 56.

The square root of 685966349 is about 26190.9592989642. The cubic root of 685966349 is about 881.9303137371.

The spelling of 685966349 in words is "six hundred eighty-five million, nine hundred sixty-six thousand, three hundred forty-nine".