686140726 has 8 divisors (see below), whose sum is σ = 1029362544. Its totient is φ = 343019880.

The previous prime is 686140687. The next prime is 686140727. The reversal of 686140726 is 627041686.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686140727) 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, 5010 + ... + 37381.

It is an arithmetic number, because the mean of its divisors is an integer number (128670318).

Almost surely, 2^686140726 is an apocalyptic number.

686140726 is a deficient number, since it is larger than the sum of its proper divisors (343221818).

686140726 is a wasteful number, since it uses less digits than its factorization.

686140726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50486.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 686140726 is about 26194.2880414796. The cubic root of 686140726 is about 882.0050381669.

The spelling of 686140726 in words is "six hundred eighty-six million, one hundred forty thousand, seven hundred twenty-six".