2723681 has 4 divisors (see below), whose sum is σ = 2797332. Its totient is φ = 2650032.

The previous prime is 2723641. The next prime is 2723687. The reversal of 2723681 is 1863272.

It is a happy number.

2723681 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 2 ways, for example, as 2016400 + 707281 = 1420^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 2723681 - 2¹⁴ = 2707297 is a prime.

It is a super-2 number, since 2×2723681² = 14836876379522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2723687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36770 + ... + 36843.

It is an arithmetic number, because the mean of its divisors is an integer number (699333).

2^2723681 is an apocalyptic number.

It is an amenable number.

2723681 is a deficient number, since it is larger than the sum of its proper divisors (73651).

2723681 is an equidigital number, since it uses as much as digits as its factorization.

2723681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73650.

The product of its digits is 4032, while the sum is 29.

The square root of 2723681 is about 1650.3578399850. The cubic root of 2723681 is about 139.6535823024.

The spelling of 2723681 in words is "two million, seven hundred twenty-three thousand, six hundred eighty-one".