1811841 has 4 divisors (see below), whose sum is σ = 2415792. Its totient is φ = 1207892.

The previous prime is 1811837. The next prime is 1811851. The reversal of 1811841 is 1481181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1811841 - 2² = 1811837 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1811851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301971 + ... + 301976.

It is an arithmetic number, because the mean of its divisors is an integer number (603948).

2^1811841 is an apocalyptic number.

It is an amenable number.

1811841 is a deficient number, since it is larger than the sum of its proper divisors (603951).

1811841 is an equidigital number, since it uses as much as digits as its factorization.

1811841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603950.

The product of its digits is 256, while the sum is 24.

The square root of 1811841 is about 1346.0464330773. The cubic root of 1811841 is about 121.9101954893.

The spelling of 1811841 in words is "one million, eight hundred eleven thousand, eight hundred forty-one".