686823842 has 8 divisors (see below), whose sum is σ = 1030504896. Its totient is φ = 343322212.

The previous prime is 686823833. The next prime is 686823847. The reversal of 686823842 is 248328686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (686823847) 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, 34838 + ... + 50865.

It is an arithmetic number, because the mean of its divisors is an integer number (128813112).

Almost surely, 2^686823842 is an apocalyptic number.

686823842 is a deficient number, since it is larger than the sum of its proper divisors (343681054).

686823842 is a wasteful number, since it uses less digits than its factorization.

686823842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89712.

The product of its digits is 884736, while the sum is 47.

The square root of 686823842 is about 26207.3242052675. The cubic root of 686823842 is about 882.2976467089.

The spelling of 686823842 in words is "six hundred eighty-six million, eight hundred twenty-three thousand, eight hundred forty-two".