686840001 has 24 divisors (see below), whose sum is σ = 976318944. Its totient is φ = 429411840.

The previous prime is 686839969. The next prime is 686840009. The reversal of 686840001 is 100048686.

It is not a de Polignac number, because 686840001 - 2⁵ = 686839969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686840009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270106 + ... + 272636.

It is an arithmetic number, because the mean of its divisors is an integer number (40679956).

Almost surely, 2^686840001 is an apocalyptic number.

It is an amenable number.

686840001 is a deficient number, since it is larger than the sum of its proper divisors (289478943).

686840001 is a wasteful number, since it uses less digits than its factorization.

686840001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2864 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 686840001 is about 26207.6324951339. The cubic root of 686840001 is about 882.3045659677.

Adding to 686840001 its reverse (100048686), we get a palindrome (786888687).

The spelling of 686840001 in words is "six hundred eighty-six million, eight hundred forty thousand, one".