681446 has 4 divisors (see below), whose sum is σ = 1022172. Its totient is φ = 340722.

The previous prime is 681427. The next prime is 681449. The reversal of 681446 is 644186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 644186 = 2 ⋅322093.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681446.

It is not an unprimeable number, because it can be changed into a prime (681449) by changing a digit.

681446 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 170360 + ... + 170363.

It is an arithmetic number, because the mean of its divisors is an integer number (255543).

2⁶⁸¹⁴⁴⁶ is an apocalyptic number.

681446 is a deficient number, since it is larger than the sum of its proper divisors (340726).

681446 is a wasteful number, since it uses less digits than its factorization.

681446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340725.

The product of its digits is 4608, while the sum is 29.

The square root of 681446 is about 825.4974257985. The cubic root of 681446 is about 87.9988808398.

The spelling of 681446 in words is "six hundred eighty-one thousand, four hundred forty-six".