1821195 has 12 divisors (see below), whose sum is σ = 3156816. Its totient is φ = 971280.

The previous prime is 1821191. The next prime is 1821233. The reversal of 1821195 is 5911281.

It is not a de Polignac number, because 1821195 - 2² = 1821191 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1821191) 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 11 ways as a sum of consecutive naturals, for example, 20191 + ... + 20280.

It is an arithmetic number, because the mean of its divisors is an integer number (263068).

2^1821195 is an apocalyptic number.

1821195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1821195 is a deficient number, since it is larger than the sum of its proper divisors (1335621).

1821195 is a wasteful number, since it uses less digits than its factorization.

1821195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40482 (or 40479 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1821195 is about 1349.5165801130. The cubic root of 1821195 is about 122.1196309293.

It can be divided in two parts, 1821 and 195, that added together give a triangular number (2016 = T₆₃).

The spelling of 1821195 in words is "one million, eight hundred twenty-one thousand, one hundred ninety-five".