681849 has 24 divisors (see below), whose sum is σ = 1148160. Its totient is φ = 381888.

The previous prime is 681841. The next prime is 681883. The reversal of 681849 is 948186.

It is a happy number.

It is not a de Polignac number, because 681849 - 2³ = 681841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681841) 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, 4909 + ... + 5045.

It is an arithmetic number, because the mean of its divisors is an integer number (47840).

2⁶⁸¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

681849 is a deficient number, since it is larger than the sum of its proper divisors (466311).

681849 is a wasteful number, since it uses less digits than its factorization.

681849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 226 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 681849 is about 825.7414849697. The cubic root of 681849 is about 88.0162246255.

The spelling of 681849 in words is "six hundred eighty-one thousand, eight hundred forty-nine".