1860821 has 2 divisors, whose sum is σ = 1860822. Its totient is φ = 1860820.

The previous prime is 1860799. The next prime is 1860829. The reversal of 1860821 is 1280681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1653796 + 207025 = 1286^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860821 - 2⁶ = 1860757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1860829) 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 as a sum of consecutive naturals, namely, 930410 + 930411.

It is an arithmetic number, because the mean of its divisors is an integer number (930411).

2^1860821 is an apocalyptic number.

It is an amenable number.

1860821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860821 is an equidigital number, since it uses as much as digits as its factorization.

1860821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 1860821 is about 1364.1191296951. The cubic root of 1860821 is about 122.9989864856.

The spelling of 1860821 in words is "one million, eight hundred sixty thousand, eight hundred twenty-one".