1844021 has 2 divisors, whose sum is σ = 1844022. Its totient is φ = 1844020.

The previous prime is 1843999. The next prime is 1844027. The reversal of 1844021 is 1204481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 343396 = 1225^2 + 586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1844021 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1843984 and 1844002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1844027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 922010 + 922011.

It is an arithmetic number, because the mean of its divisors is an integer number (922011).

2^1844021 is an apocalyptic number.

It is an amenable number.

1844021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1844021 is an equidigital number, since it uses as much as digits as its factorization.

1844021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1844021 is about 1357.9473480220. The cubic root of 1844021 is about 122.6277107645.

The spelling of 1844021 in words is "one million, eight hundred forty-four thousand, twenty-one".