685812837 has 4 divisors (see below), whose sum is σ = 914417120. Its totient is φ = 457208556.

The previous prime is 685812823. The next prime is 685812859. The reversal of 685812837 is 738218586.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 685812837 - 2⁷ = 685812709 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 (685812817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114302137 + ... + 114302142.

It is an arithmetic number, because the mean of its divisors is an integer number (228604280).

Almost surely, 2^685812837 is an apocalyptic number.

It is an amenable number.

685812837 is a deficient number, since it is larger than the sum of its proper divisors (228604283).

685812837 is a wasteful number, since it uses less digits than its factorization.

685812837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228604282.

The product of its digits is 645120, while the sum is 48.

The square root of 685812837 is about 26188.0285054068. The cubic root of 685812837 is about 881.8645199426.

The spelling of 685812837 in words is "six hundred eighty-five million, eight hundred twelve thousand, eight hundred thirty-seven".