2721813 has 8 divisors (see below), whose sum is σ = 3641376. Its totient is φ = 1808400.

The previous prime is 2721811. The next prime is 2721821. The reversal of 2721813 is 3181272.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2721813 - 2¹ = 2721811 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (455172).

2^2721813 is an apocalyptic number.

It is an amenable number.

2721813 is a deficient number, since it is larger than the sum of its proper divisors (919563).

2721813 is a wasteful number, since it uses less digits than its factorization.

2721813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075.

The product of its digits is 672, while the sum is 24.

The square root of 2721813 is about 1649.7918050469. The cubic root of 2721813 is about 139.6216484901.

The spelling of 2721813 in words is "two million, seven hundred twenty-one thousand, eight hundred thirteen".