686412249 has 8 divisors (see below), whose sum is σ = 916891680. Its totient is φ = 456770496.

The previous prime is 686412203. The next prime is 686412263. The reversal of 686412249 is 942214686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686412249 - 2⁷ = 686412121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686412249.

It is not an unprimeable number, because it can be changed into a prime (686412289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207504 + ... + 210785.

It is an arithmetic number, because the mean of its divisors is an integer number (114611460).

Almost surely, 2^686412249 is an apocalyptic number.

It is an amenable number.

686412249 is a deficient number, since it is larger than the sum of its proper divisors (230479431).

686412249 is a wasteful number, since it uses less digits than its factorization.

686412249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418839.

The product of its digits is 165888, while the sum is 42.

The square root of 686412249 is about 26199.4703954107. The cubic root of 686412249 is about 882.1213666215.

The spelling of 686412249 in words is "six hundred eighty-six million, four hundred twelve thousand, two hundred forty-nine".