1820241 has 12 divisors (see below), whose sum is σ = 2784132. Its totient is φ = 1142016.

The previous prime is 1820237. The next prime is 1820249. The reversal of 1820241 is 1420281.

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 140625 = 1296^2 + 375^2 .

It is not a de Polignac number, because 1820241 - 2² = 1820237 is a prime.

1820241 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1820249) 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 11 ways as a sum of consecutive naturals, for example, 5796 + ... + 6101.

It is an arithmetic number, because the mean of its divisors is an integer number (232011).

2^1820241 is an apocalyptic number.

It is an amenable number.

1820241 is a deficient number, since it is larger than the sum of its proper divisors (963891).

1820241 is a wasteful number, since it uses less digits than its factorization.

1820241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11920 (or 11917 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1820241 is about 1349.1630739092. The cubic root of 1820241 is about 122.0983038197.

The spelling of 1820241 in words is "one million, eight hundred twenty thousand, two hundred forty-one".