2021638 has 8 divisors (see below), whose sum is σ = 3192120. Its totient is φ = 957600.

The previous prime is 2021629. The next prime is 2021639. The reversal of 2021638 is 8361202.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021639) 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, 26563 + ... + 26638.

It is an arithmetic number, because the mean of its divisors is an integer number (399015).

2^2021638 is an apocalyptic number.

2021638 is a deficient number, since it is larger than the sum of its proper divisors (1170482).

2021638 is a wasteful number, since it uses less digits than its factorization.

2021638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53222.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2021638 is about 1421.8431699734. The cubic root of 2021638 is about 126.4448456879. Note that the first 3 decimals are identical.

The spelling of 2021638 in words is "two million, twenty-one thousand, six hundred thirty-eight".