839681 has 4 divisors (see below), whose sum is σ = 889092. Its totient is φ = 790272.

The previous prime is 839669. The next prime is 839693. The reversal of 839681 is 186938.

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

It is an interprime number because it is at equal distance from previous prime (839669) and next prime (839693).

It can be written as a sum of positive squares in 2 ways, for example, as 672400 + 167281 = 820^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 839681 - 2⁶ = 839617 is a prime.

It is a super-2 number, since 2×839681² = 1410128363522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24680 + ... + 24713.

It is an arithmetic number, because the mean of its divisors is an integer number (222273).

It is a Proth number, since it is equal to 205 ⋅ 2¹² + 1 and 205 < 2¹².

2⁸³⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

839681 is a deficient number, since it is larger than the sum of its proper divisors (49411).

839681 is a wasteful number, since it uses less digits than its factorization.

839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49410.

The product of its digits is 10368, while the sum is 35.

The square root of 839681 is about 916.3410936982. The cubic root of 839681 is about 94.3419340910.

The spelling of 839681 in words is "eight hundred thirty-nine thousand, six hundred eighty-one".