686873394 has 24 divisors (see below), whose sum is σ = 1488743100. Its totient is φ = 228878208.

The previous prime is 686873371. The next prime is 686873441. The reversal of 686873394 is 493378686.

686873394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 581051025 + 105822369 = 24105^2 + 10287^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 686873394.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71382 + ... + 80430.

Almost surely, 2^686873394 is an apocalyptic number.

686873394 is an abundant number, since it is smaller than the sum of its proper divisors (801869706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686873394 is a wasteful number, since it uses less digits than its factorization.

686873394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13274 (or 13271 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 686873394 is about 26208.2695727894. The cubic root of 686873394 is about 882.3188644549.

The spelling of 686873394 in words is "six hundred eighty-six million, eight hundred seventy-three thousand, three hundred ninety-four".