685398107 has 4 divisors (see below), whose sum is σ = 702115176. Its totient is φ = 668681040.

The previous prime is 685398097. The next prime is 685398121. The reversal of 685398107 is 701893586.

It is a happy number.

685398107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 685398107 - 2¹⁸ = 685135963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685388107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8358473 + ... + 8358554.

It is an arithmetic number, because the mean of its divisors is an integer number (175528794).

Almost surely, 2^685398107 is an apocalyptic number.

685398107 is a deficient number, since it is larger than the sum of its proper divisors (16717069).

685398107 is a wasteful number, since it uses less digits than its factorization.

685398107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16717068.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 685398107 is about 26180.1089951895. The cubic root of 685398107 is about 881.6867214720.

The spelling of 685398107 in words is "six hundred eighty-five million, three hundred ninety-eight thousand, one hundred seven".