686405795 has 4 divisors (see below), whose sum is σ = 823686960. Its totient is φ = 549124632.

The previous prime is 686405789. The next prime is 686405803. The reversal of 686405795 is 597504686.

686405795 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 597504686 = 2 ⋅298752343.

It is a cyclic number.

It is not a de Polignac number, because 686405795 - 2⁴ = 686405779 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68640575 + ... + 68640584.

It is an arithmetic number, because the mean of its divisors is an integer number (205921740).

Almost surely, 2^686405795 is an apocalyptic number.

686405795 is a deficient number, since it is larger than the sum of its proper divisors (137281165).

686405795 is a wasteful number, since it uses less digits than its factorization.

686405795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137281164.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 686405795 is about 26199.3472246925. The cubic root of 686405795 is about 882.1186018937.

The spelling of 686405795 in words is "six hundred eighty-six million, four hundred five thousand, seven hundred ninety-five".