681830 has 16 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 265920.

The previous prime is 681823. The next prime is 681833. The reversal of 681830 is 38186.

It is a self number, because there is not a number n which added to its sum of digits gives 681830.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681833) 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 7 ways as a sum of consecutive naturals, for example, 422 + ... + 1241.

It is an arithmetic number, because the mean of its divisors is an integer number (78624).

2⁶⁸¹⁸³⁰ is an apocalyptic number.

681830 is a deficient number, since it is larger than the sum of its proper divisors (576154).

681830 is a wasteful number, since it uses less digits than its factorization.

681830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 681830 is about 825.7299800782. The cubic root of 681830 is about 88.0154070820.

The spelling of 681830 in words is "six hundred eighty-one thousand, eight hundred thirty".