686407417 has 4 divisors (see below), whose sum is σ = 686460580. Its totient is φ = 686354256.

The previous prime is 686407349. The next prime is 686407439. The reversal of 686407417 is 714704686.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 523997881 + 162409536 = 22891^2 + 12744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686407417 is a prime.

It is a super-2 number, since 2×686407417² = 942310284225223778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686407217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6559 + ... + 37627.

It is an arithmetic number, because the mean of its divisors is an integer number (171615145).

Almost surely, 2^686407417 is an apocalyptic number.

It is an amenable number.

686407417 is a deficient number, since it is larger than the sum of its proper divisors (53163).

686407417 is a wasteful number, since it uses less digits than its factorization.

686407417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53162.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 686407417 is about 26199.3781796439. The cubic root of 686407417 is about 882.1192967184.

The spelling of 686407417 in words is "six hundred eighty-six million, four hundred seven thousand, four hundred seventeen".