686838457 has 4 divisors (see below), whose sum is σ = 693257616. Its totient is φ = 680419300.

The previous prime is 686838431. The next prime is 686838461. The reversal of 686838457 is 754838686.

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 686838457 - 2²⁷ = 552620729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686838398 and 686838407.

It is not an unprimeable number, because it can be changed into a prime (686838497) 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, 3209419 + ... + 3209632.

It is an arithmetic number, because the mean of its divisors is an integer number (173314404).

Almost surely, 2^686838457 is an apocalyptic number.

It is an amenable number.

686838457 is a deficient number, since it is larger than the sum of its proper divisors (6419159).

686838457 is a wasteful number, since it uses less digits than its factorization.

686838457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6419158.

The product of its digits is 7741440, while the sum is 55.

The square root of 686838457 is about 26207.6030380499. The cubic root of 686838457 is about 882.3039048340.

The spelling of 686838457 in words is "six hundred eighty-six million, eight hundred thirty-eight thousand, four hundred fifty-seven".