4093681 has 4 divisors (see below), whose sum is σ = 4104100. Its totient is φ = 4083264.

The previous prime is 4093679. The next prime is 4093709. The reversal of 4093681 is 1863904.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3964081 + 129600 = 1991^2 + 360^2 .

It is a cyclic number.

It is not a de Polignac number, because 4093681 - 2¹ = 4093679 is a prime.

It is a super-2 number, since 2×4093681² = 33516448259522, which contains 22 as substring.

It is a Duffinian number.

4093681 is a modest number, since divided by 3681 gives 409 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4093601) 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, 4596 + ... + 5413.

It is an arithmetic number, because the mean of its divisors is an integer number (1026025).

Almost surely, 2^4093681 is an apocalyptic number.

It is an amenable number.

4093681 is a deficient number, since it is larger than the sum of its proper divisors (10419).

4093681 is a wasteful number, since it uses less digits than its factorization.

4093681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10418.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 4093681 is about 2023.2847056210. The cubic root of 4093681 is about 159.9697989872.

It can be divided in two parts, 4093 and 681, that added together give a palindrome (4774).

The spelling of 4093681 in words is "four million, ninety-three thousand, six hundred eighty-one".