686385449 has 4 divisors (see below), whose sum is σ = 690931200. Its totient is φ = 681839700.

The previous prime is 686385433. The next prime is 686385451. The reversal of 686385449 is 944583686.

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 686385449 - 2⁴ = 686385433 is a prime.

It is a super-2 number, since 2×686385449² = 942249969197863202, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686385449.

It is not an unprimeable number, because it can be changed into a prime (686385499) 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, 2272649 + ... + 2272950.

It is an arithmetic number, because the mean of its divisors is an integer number (172732800).

Almost surely, 2^686385449 is an apocalyptic number.

It is an amenable number.

686385449 is a deficient number, since it is larger than the sum of its proper divisors (4545751).

686385449 is a wasteful number, since it uses less digits than its factorization.

686385449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545750.

The product of its digits is 4976640, while the sum is 53.

The square root of 686385449 is about 26198.9589296980. The cubic root of 686385449 is about 882.1098860764.

The spelling of 686385449 in words is "six hundred eighty-six million, three hundred eighty-five thousand, four hundred forty-nine".