1844821 has 4 divisors (see below), whose sum is σ = 2012544. Its totient is φ = 1677100.

The previous prime is 1844819. The next prime is 1844827. The reversal of 1844821 is 1284481.

It is the 555-th star number.

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 1844821 - 2¹ = 1844819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1844821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1844827) 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, 83845 + ... + 83866.

It is an arithmetic number, because the mean of its divisors is an integer number (503136).

2^1844821 is an apocalyptic number.

1844821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1844821 is a deficient number, since it is larger than the sum of its proper divisors (167723).

1844821 is a wasteful number, since it uses less digits than its factorization.

1844821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167722.

The product of its digits is 2048, while the sum is 28.

The square root of 1844821 is about 1358.2418783118. The cubic root of 1844821 is about 122.6454415794.

It can be divided in two parts, 184 and 4821, that added together give a palindrome (5005).

The spelling of 1844821 in words is "one million, eight hundred forty-four thousand, eight hundred twenty-one".