1822861 has 4 divisors (see below), whose sum is σ = 1825852. Its totient is φ = 1819872.

The previous prime is 1822837. The next prime is 1822867. The reversal of 1822861 is 1682281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 1729225 = 306^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1822861 - 2¹¹ = 1820813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822867) 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 in 3 ways as a sum of consecutive naturals, for example, 216 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (456463).

2^1822861 is an apocalyptic number.

1822861 is the 780-th hex number.

It is an amenable number.

1822861 is a deficient number, since it is larger than the sum of its proper divisors (2991).

1822861 is an equidigital number, since it uses as much as digits as its factorization.

1822861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2990.

The product of its digits is 1536, while the sum is 28.

The square root of 1822861 is about 1350.1336970834. The cubic root of 1822861 is about 122.1568572741.

The spelling of 1822861 in words is "one million, eight hundred twenty-two thousand, eight hundred sixty-one".