688986423 has 12 divisors (see below), whose sum is σ = 998722920. Its totient is φ = 457699536.

The previous prime is 688986409. The next prime is 688986433. The reversal of 688986423 is 324689886.

688986423 is a `hidden beast` number, since 68 + 89 + 86 + 423 = 666.

It is not a de Polignac number, because 688986423 - 2¹³ = 688978231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688986423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688986433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132708 + ... + 137801.

It is an arithmetic number, because the mean of its divisors is an integer number (83226910).

Almost surely, 2^688986423 is an apocalyptic number.

688986423 is a deficient number, since it is larger than the sum of its proper divisors (309736497).

688986423 is a wasteful number, since it uses less digits than its factorization.

688986423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270798 (or 270795 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 688986423 is about 26248.5508742864. The cubic root of 688986423 is about 883.2226976029. Note that the first 3 decimals are identical.

The spelling of 688986423 in words is "six hundred eighty-eight million, nine hundred eighty-six thousand, four hundred twenty-three".