686115387 has 20 divisors (see below), whose sum is σ = 1030988200. Its totient is φ = 450967860.

The previous prime is 686115377. The next prime is 686115401. The reversal of 686115387 is 783511686.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

686115387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686115387 - 2⁴ = 686115371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686115337) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9663562 + ... + 9663632.

It is an arithmetic number, because the mean of its divisors is an integer number (51549410).

Almost surely, 2^686115387 is an apocalyptic number.

686115387 is a deficient number, since it is larger than the sum of its proper divisors (344872813).

686115387 is an frugal number, since it uses more digits than its factorization.

686115387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 74 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 686115387 is about 26193.8043628641. The cubic root of 686115387 is about 881.9941806271.

The spelling of 686115387 in words is "six hundred eighty-six million, one hundred fifteen thousand, three hundred eighty-seven".