686374523 has 4 divisors (see below), whose sum is σ = 710042640. Its totient is φ = 662706408.

The previous prime is 686374519. The next prime is 686374561. The reversal of 686374523 is 325473686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686374523 - 2² = 686374519 is a prime.

It is a super-2 number, since 2×686374523² = 942219971646955058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686374723) 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, 11834015 + ... + 11834072.

It is an arithmetic number, because the mean of its divisors is an integer number (177510660).

Almost surely, 2^686374523 is an apocalyptic number.

686374523 is a deficient number, since it is larger than the sum of its proper divisors (23668117).

686374523 is a wasteful number, since it uses less digits than its factorization.

686374523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23668116.

The product of its digits is 725760, while the sum is 44.

The square root of 686374523 is about 26198.7504091321. The cubic root of 686374523 is about 882.1052055267.

The spelling of 686374523 in words is "six hundred eighty-six million, three hundred seventy-four thousand, five hundred twenty-three".