686837385 has 48 divisors (see below), whose sum is σ = 1337865984. Its totient is φ = 323427456.

The previous prime is 686837357. The next prime is 686837407. The reversal of 686837385 is 583738686.

It is a happy number.

It is not a de Polignac number, because 686837385 - 2¹² = 686833289 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 12069 + ... + 38978.

It is an arithmetic number, because the mean of its divisors is an integer number (27872208).

Almost surely, 2^686837385 is an apocalyptic number.

686837385 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

686837385 is a deficient number, since it is larger than the sum of its proper divisors (651028599).

686837385 is a wasteful number, since it uses less digits than its factorization.

686837385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51094 (or 51091 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 686837385 is about 26207.5825859616. The cubic root of 686837385 is about 882.3034458079.

It can be divided in two parts, 6868 and 37385, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 686837385 in words is "six hundred eighty-six million, eight hundred thirty-seven thousand, three hundred eighty-five".