686407699 has 16 divisors (see below), whose sum is σ = 779961600. Its totient is φ = 600548256.

The previous prime is 686407681. The next prime is 686407703. The reversal of 686407699 is 996704686.

It is a cyclic number.

It is not a de Polignac number, because 686407699 - 2¹³ = 686399507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686407619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14409 + ... + 39754.

It is an arithmetic number, because the mean of its divisors is an integer number (48747600).

Almost surely, 2^686407699 is an apocalyptic number.

686407699 is a deficient number, since it is larger than the sum of its proper divisors (93553901).

686407699 is a wasteful number, since it uses less digits than its factorization.

686407699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54234.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The square root of 686407699 is about 26199.3835614504. The cubic root of 686407699 is about 882.1194175202.

The spelling of 686407699 in words is "six hundred eighty-six million, four hundred seven thousand, six hundred ninety-nine".