2723682821 has 4 divisors (see below), whose sum is σ = 2727730572. Its totient is φ = 2719635072.

The previous prime is 2723682809. The next prime is 2723682833. The reversal of 2723682821 is 1282863272.

It is a happy number.

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 (2723682809) and next prime (2723682833).

It can be written as a sum of positive squares in 2 ways, for example, as 1871860225 + 851822596 = 43265^2 + 29186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2723682821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2723682721) 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, 2022866 + ... + 2024211.

It is an arithmetic number, because the mean of its divisors is an integer number (681932643).

Almost surely, 2^2723682821 is an apocalyptic number.

It is an amenable number.

2723682821 is a deficient number, since it is larger than the sum of its proper divisors (4047751).

2723682821 is an equidigital number, since it uses as much as digits as its factorization.

2723682821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4047750.

The product of its digits is 129024, while the sum is 41.

The square root of 2723682821 is about 52188.9147329201. The cubic root of 2723682821 is about 1396.5361342558.

The spelling of 2723682821 in words is "two billion, seven hundred twenty-three million, six hundred eighty-two thousand, eight hundred twenty-one".