686444907 has 4 divisors (see below), whose sum is σ = 915259880. Its totient is φ = 457629936.

The previous prime is 686444851. The next prime is 686444909. The reversal of 686444907 is 709444686.

686444907 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 not a de Polignac number, because 686444907 - 2¹¹ = 686442859 is a prime.

It is a super-2 number, since 2×686444907² = 942413220692477298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686444909) 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, 114407482 + ... + 114407487.

It is an arithmetic number, because the mean of its divisors is an integer number (228814970).

Almost surely, 2^686444907 is an apocalyptic number.

686444907 is a deficient number, since it is larger than the sum of its proper divisors (228814973).

686444907 is a wasteful number, since it uses less digits than its factorization.

686444907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228814972.

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 686444907 is about 26200.0936448708. The cubic root of 686444907 is about 882.1353562042.

The spelling of 686444907 in words is "six hundred eighty-six million, four hundred forty-four thousand, nine hundred seven".