686223493 has 4 divisors (see below), whose sum is σ = 693298060. Its totient is φ = 679148928.

The previous prime is 686223481. The next prime is 686223509. The reversal of 686223493 is 394322686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 254498209 + 431725284 = 15953^2 + 20778^2 .

It is a cyclic number.

It is not a de Polignac number, because 686223493 - 2¹³ = 686215301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686223403) 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, 3537138 + ... + 3537331.

It is an arithmetic number, because the mean of its divisors is an integer number (173324515).

Almost surely, 2^686223493 is an apocalyptic number.

It is an amenable number.

686223493 is a deficient number, since it is larger than the sum of its proper divisors (7074567).

686223493 is an equidigital number, since it uses as much as digits as its factorization.

686223493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7074566.

The product of its digits is 373248, while the sum is 43.

The square root of 686223493 is about 26195.8678611723. The cubic root of 686223493 is about 882.0405012399.

The spelling of 686223493 in words is "six hundred eighty-six million, two hundred twenty-three thousand, four hundred ninety-three".