685105399 has 4 divisors (see below), whose sum is σ = 747387720. Its totient is φ = 622823080.

The previous prime is 685105397. The next prime is 685105403. The reversal of 685105399 is 993501586.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 685105399 - 2¹ = 685105397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685105391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31141144 + ... + 31141165.

It is an arithmetic number, because the mean of its divisors is an integer number (186846930).

Almost surely, 2^685105399 is an apocalyptic number.

685105399 is a deficient number, since it is larger than the sum of its proper divisors (62282321).

685105399 is a wasteful number, since it uses less digits than its factorization.

685105399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62282320.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 685105399 is about 26174.5181235491. The cubic root of 685105399 is about 881.5611917489.

The spelling of 685105399 in words is "six hundred eighty-five million, one hundred five thousand, three hundred ninety-nine".