9439681 has 4 divisors (see below), whose sum is σ = 9523332. Its totient is φ = 9356032.

The previous prime is 9439679. The next prime is 9439687. The reversal of 9439681 is 1869349.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1869349 = 317 ⋅5897.

It can be written as a sum of positive squares in 2 ways, for example, as 5216656 + 4223025 = 2284^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 9439681 - 2¹ = 9439679 is a prime.

It is a super-2 number, since 2×9439681² = 178215154763522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9439687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41656 + ... + 41881.

It is an arithmetic number, because the mean of its divisors is an integer number (2380833).

Almost surely, 2^9439681 is an apocalyptic number.

It is an amenable number.

9439681 is a deficient number, since it is larger than the sum of its proper divisors (83651).

9439681 is a wasteful number, since it uses less digits than its factorization.

9439681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83650.

The product of its digits is 46656, while the sum is 40.

The square root of 9439681 is about 3072.4063858806. The cubic root of 9439681 is about 211.3419804158.

The spelling of 9439681 in words is "nine million, four hundred thirty-nine thousand, six hundred eighty-one".