686508394 has 32 divisors (see below), whose sum is σ = 1211656320. Its totient is φ = 287601600.

The previous prime is 686508371. The next prime is 686508401. The reversal of 686508394 is 493805686.

It is a happy number.

686508394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238524 + ... + 241384.

It is an arithmetic number, because the mean of its divisors is an integer number (37864260).

Almost surely, 2^686508394 is an apocalyptic number.

686508394 is a deficient number, since it is larger than the sum of its proper divisors (525147926).

686508394 is a wasteful number, since it uses less digits than its factorization.

686508394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3726.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 686508394 is about 26201.3051964974. The cubic root of 686508394 is about 882.1625506182.

The spelling of 686508394 in words is "six hundred eighty-six million, five hundred eight thousand, three hundred ninety-four".