2827821 has 4 divisors (see below), whose sum is σ = 3770432. Its totient is φ = 1885212.

The previous prime is 2827813. The next prime is 2827823. The reversal of 2827821 is 1287282.

It is a happy number.

2827821 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2827821 - 2³ = 2827813 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2827823) 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, 471301 + ... + 471306.

It is an arithmetic number, because the mean of its divisors is an integer number (942608).

2^2827821 is an apocalyptic number.

It is an amenable number.

2827821 is a deficient number, since it is larger than the sum of its proper divisors (942611).

2827821 is an equidigital number, since it uses as much as digits as its factorization.

2827821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942610.

The product of its digits is 3584, while the sum is 30.

The square root of 2827821 is about 1681.6126188870. The cubic root of 2827821 is about 141.4112534365.

The spelling of 2827821 in words is "two million, eight hundred twenty-seven thousand, eight hundred twenty-one".