2730821 has 8 divisors (see below), whose sum is σ = 2843904. Its totient is φ = 2619360.

The previous prime is 2730817. The next prime is 2730823. The reversal of 2730821 is 1280372.

2730821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2730821 - 2² = 2730817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730823) 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 7 ways as a sum of consecutive naturals, for example, 3926 + ... + 4568.

It is an arithmetic number, because the mean of its divisors is an integer number (355488).

2^2730821 is an apocalyptic number.

It is an amenable number.

2730821 is a deficient number, since it is larger than the sum of its proper divisors (113083).

2730821 is a wasteful number, since it uses less digits than its factorization.

2730821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2730821 is about 1652.5195914119. The cubic root of 2730821 is about 139.7755075618.

The spelling of 2730821 in words is "two million, seven hundred thirty thousand, eight hundred twenty-one".