2742821 has 8 divisors (see below), whose sum is σ = 2904000. Its totient is φ = 2583360.

The previous prime is 2742811. The next prime is 2742853. The reversal of 2742821 is 1282472.

2742821 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 2742821 - 2⁶ = 2742757 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 (2742811) 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, 4280 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (363000).

2^2742821 is an apocalyptic number.

It is an amenable number.

2742821 is a deficient number, since it is larger than the sum of its proper divisors (161179).

2742821 is a wasteful number, since it uses less digits than its factorization.

2742821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 1792, while the sum is 26.

The square root of 2742821 is about 1656.1464307240. The cubic root of 2742821 is about 139.9799461072.

The spelling of 2742821 in words is "two million, seven hundred forty-two thousand, eight hundred twenty-one".