686405786 has 8 divisors (see below), whose sum is σ = 1123209504. Its totient is φ = 312002620.

The previous prime is 686405779. The next prime is 686405789. The reversal of 686405786 is 687504686.

It is a happy number.

686405786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (686405789) 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, 15600110 + ... + 15600153.

It is an arithmetic number, because the mean of its divisors is an integer number (140401188).

Almost surely, 2^686405786 is an apocalyptic number.

686405786 is a deficient number, since it is larger than the sum of its proper divisors (436803718).

686405786 is a wasteful number, since it uses less digits than its factorization.

686405786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31200276.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 686405786 is about 26199.3470529324. The cubic root of 686405786 is about 882.1185980383.

The spelling of 686405786 in words is "six hundred eighty-six million, four hundred five thousand, seven hundred eighty-six".