1886821 has 2 divisors, whose sum is σ = 1886822. Its totient is φ = 1886820.

The previous prime is 1886809. The next prime is 1886849. The reversal of 1886821 is 1286881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1718721 + 168100 = 1311^2 + 410^2 .

It is an emirp because it is prime and its reverse (1286881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1886821 - 2⁷ = 1886693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1886891) 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, 943410 + 943411.

It is an arithmetic number, because the mean of its divisors is an integer number (943411).

2^1886821 is an apocalyptic number.

It is an amenable number.

1886821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1886821 is an equidigital number, since it uses as much as digits as its factorization.

1886821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 34.

The square root of 1886821 is about 1373.6160307742. The cubic root of 1886821 is about 123.5691996371.

The spelling of 1886821 in words is "one million, eight hundred eighty-six thousand, eight hundred twenty-one".