1821842 has 8 divisors (see below), whose sum is σ = 2981232. Its totient is φ = 828100.

The previous prime is 1821821. The next prime is 1821847. The reversal of 1821842 is 2481281.

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

It is not an unprimeable number, because it can be changed into a prime (1821847) 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, 41384 + ... + 41427.

It is an arithmetic number, because the mean of its divisors is an integer number (372654).

2^1821842 is an apocalyptic number.

1821842 is a deficient number, since it is larger than the sum of its proper divisors (1159390).

1821842 is a wasteful number, since it uses less digits than its factorization.

1821842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82824.

The product of its digits is 1024, while the sum is 26.

The square root of 1821842 is about 1349.7562742955. The cubic root of 1821842 is about 122.1340906745.

The spelling of 1821842 in words is "one million, eight hundred twenty-one thousand, eight hundred forty-two".