686895841 has 4 divisors (see below), whose sum is σ = 689430784. Its totient is φ = 684360900.

The previous prime is 686895821. The next prime is 686895893. The reversal of 686895841 is 148598686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686895841 - 2⁹ = 686895329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686895821) 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, 1267065 + ... + 1267606.

It is an arithmetic number, because the mean of its divisors is an integer number (172357696).

Almost surely, 2^686895841 is an apocalyptic number.

It is an amenable number.

686895841 is a deficient number, since it is larger than the sum of its proper divisors (2534943).

686895841 is a wasteful number, since it uses less digits than its factorization.

686895841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534942.

The product of its digits is 3317760, while the sum is 55.

The square root of 686895841 is about 26208.6978119860. The cubic root of 686895841 is about 882.3284757341.

The spelling of 686895841 in words is "six hundred eighty-six million, eight hundred ninety-five thousand, eight hundred forty-one".