686439953 has 16 divisors (see below), whose sum is σ = 703795200. Its totient is φ = 669404736.

The previous prime is 686439937. The next prime is 686439979. The reversal of 686439953 is 359934686.

It is a cyclic number.

It is not a de Polignac number, because 686439953 - 2⁴ = 686439937 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686439895 and 686439904.

It is not an unprimeable number, because it can be changed into a prime (686439983) 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, 3449348 + ... + 3449546.

It is an arithmetic number, because the mean of its divisors is an integer number (43987200).

Almost surely, 2^686439953 is an apocalyptic number.

It is an amenable number.

686439953 is a deficient number, since it is larger than the sum of its proper divisors (17355247).

686439953 is a wasteful number, since it uses less digits than its factorization.

686439953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its digits is 4199040, while the sum is 53.

The square root of 686439953 is about 26199.9991030534. Note that the first 3 decimals coincide. The cubic root of 686439953 is about 882.1332341067.

The spelling of 686439953 in words is "six hundred eighty-six million, four hundred thirty-nine thousand, nine hundred fifty-three".