681874 has 4 divisors (see below), whose sum is σ = 1022814. Its totient is φ = 340936.

The previous prime is 681841. The next prime is 681883. The reversal of 681874 is 478186.

It is a happy number.

681874 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 651249 + 30625 = 807^2 + 175^2 .

It is an unprimeable number.

681874 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170467 + ... + 170470.

2⁶⁸¹⁸⁷⁴ is an apocalyptic number.

681874 is a deficient number, since it is larger than the sum of its proper divisors (340940).

681874 is a wasteful number, since it uses less digits than its factorization.

681874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340939.

The product of its digits is 10752, while the sum is 34.

The square root of 681874 is about 825.7566227406. The cubic root of 681874 is about 88.0173003176.

The spelling of 681874 in words is "six hundred eighty-one thousand, eight hundred seventy-four".