2021788 has 6 divisors (see below), whose sum is σ = 3538136. Its totient is φ = 1010892.

The previous prime is 2021783. The next prime is 2021801. The reversal of 2021788 is 8871202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252720 + ... + 252727.

2^2021788 is an apocalyptic number.

It is an amenable number.

2021788 is a deficient number, since it is larger than the sum of its proper divisors (1516348).

2021788 is a wasteful number, since it uses less digits than its factorization.

2021788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505451 (or 505449 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2021788 is about 1421.8959174286. The cubic root of 2021788 is about 126.4479728976.

It can be divided in two parts, 2021 and 788, that added together give a square (2809 = 53²).

The spelling of 2021788 in words is "two million, twenty-one thousand, seven hundred eighty-eight".