2021834 has 4 divisors (see below), whose sum is σ = 3032754. Its totient is φ = 1010916.

The previous prime is 2021807. The next prime is 2021837. The reversal of 2021834 is 4381202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1951609 + 70225 = 1397^2 + 265^2 .

It is not an unprimeable number, because it can be changed into a prime (2021837) 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, 505457 + ... + 505460.

2^2021834 is an apocalyptic number.

2021834 is a deficient number, since it is larger than the sum of its proper divisors (1010920).

2021834 is a wasteful number, since it uses less digits than its factorization.

2021834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010919.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2021834 is about 1421.9120929228. The cubic root of 2021834 is about 126.4489318776.

The spelling of 2021834 in words is "two million, twenty-one thousand, eight hundred thirty-four".