681930 has 24 divisors (see below), whose sum is σ = 1773252. Its totient is φ = 181824.

The previous prime is 681913. The next prime is 681931. The reversal of 681930 is 39186.

It can be written as a sum of positive squares in 2 ways, for example, as 567009 + 114921 = 753^2 + 339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681894 and 681903.

It is not an unprimeable number, because it can be changed into a prime (681931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3699 + ... + 3878.

2⁶⁸¹⁹³⁰ is an apocalyptic number.

681930 is an abundant number, since it is smaller than the sum of its proper divisors (1091322).

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

681930 is a wasteful number, since it uses less digits than its factorization.

681930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590 (or 7587 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 681930 is about 825.7905303405. The cubic root of 681930 is about 88.0197097725.

The spelling of 681930 in words is "six hundred eighty-one thousand, nine hundred thirty".