2021838 has 72 divisors (see below), whose sum is σ = 5295528. Its totient is φ = 510048.

The previous prime is 2021837. The next prime is 2021839. The reversal of 2021838 is 8381202.

It is an interprime number because it is at equal distance from previous prime (2021837) and next prime (2021839).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021837) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87895 + ... + 87917.

It is an arithmetic number, because the mean of its divisors is an integer number (73549).

2^2021838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2647764).

2021838 is an abundant number, since it is smaller than the sum of its proper divisors (3273690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021838 is a wasteful number, since it uses less digits than its factorization.

2021838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 2021838 is about 1421.9134994788. The cubic root of 2021838 is about 126.4490152665.

The spelling of 2021838 in words is "two million, twenty-one thousand, eight hundred thirty-eight".