686843731 has 6 divisors (see below), whose sum is σ = 798981540. Its totient is φ = 588723156.

The previous prime is 686843693. The next prime is 686843737. The reversal of 686843731 is 137348686.

686843731 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 686843731 - 2¹⁷ = 686712659 is a prime.

It is a super-2 number, since 2×686843731² = 943508621628000722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (686843737) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7008561 + ... + 7008658.

It is an arithmetic number, because the mean of its divisors is an integer number (133163590).

Almost surely, 2^686843731 is an apocalyptic number.

686843731 is a deficient number, since it is larger than the sum of its proper divisors (112137809).

686843731 is a wasteful number, since it uses less digits than its factorization.

686843731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14017233 (or 14017226 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The square root of 686843731 is about 26207.7036575126. The cubic root of 686843731 is about 882.3061631326.

The spelling of 686843731 in words is "six hundred eighty-six million, eight hundred forty-three thousand, seven hundred thirty-one".