2077821 has 24 divisors (see below), whose sum is σ = 3276000. Its totient is φ = 1264032.

The previous prime is 2077813. The next prime is 2077841. The reversal of 2077821 is 1287702.

It is not a de Polignac number, because 2077821 - 2³ = 2077813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2077811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4750 + ... + 5168.

It is an arithmetic number, because the mean of its divisors is an integer number (136500).

2^2077821 is an apocalyptic number.

It is an amenable number.

2077821 is a deficient number, since it is larger than the sum of its proper divisors (1198179).

2077821 is a wasteful number, since it uses less digits than its factorization.

2077821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 2077821 is about 1441.4648799052. The cubic root of 2077821 is about 127.6054951561.

It can be divided in two parts, 20 and 77821, that added together give a square (77841 = 279²).

The spelling of 2077821 in words is "two million, seventy-seven thousand, eight hundred twenty-one".