685139926 has 4 divisors (see below), whose sum is σ = 1027709892. Its totient is φ = 342569962.

The previous prime is 685139911. The next prime is 685139947. The reversal of 685139926 is 629931586.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 685139926.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171284980 + ... + 171284983.

It is an arithmetic number, because the mean of its divisors is an integer number (256927473).

Almost surely, 2^685139926 is an apocalyptic number.

685139926 is a deficient number, since it is larger than the sum of its proper divisors (342569966).

685139926 is a wasteful number, since it uses less digits than its factorization.

685139926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342569965.

The product of its digits is 699840, while the sum is 49.

The square root of 685139926 is about 26175.1776689290. The cubic root of 685139926 is about 881.5760007364.

The spelling of 685139926 in words is "six hundred eighty-five million, one hundred thirty-nine thousand, nine hundred twenty-six".