1686686958 has 48 divisors (see below), whose sum is σ = 4094481456. Its totient is φ = 497301120.

The previous prime is 1686686957. The next prime is 1686686993. The reversal of 1686686958 is 8596866861.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1686686895 and 1686686904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686686957) 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, 107791 + ... + 122442.

It is an arithmetic number, because the mean of its divisors is an integer number (85301697).

Almost surely, 2^1686686958 is an apocalyptic number.

1686686958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1686686958 is an abundant number, since it is smaller than the sum of its proper divisors (2407794498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686686958 is a wasteful number, since it uses less digits than its factorization.

1686686958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230289 (or 230286 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The square root of 1686686958 is about 41069.2945885366. The cubic root of 1686686958 is about 1190.3595547455.

The spelling of 1686686958 in words is "one billion, six hundred eighty-six million, six hundred eighty-six thousand, nine hundred fifty-eight".