1821546 has 12 divisors (see below), whose sum is σ = 3946722. Its totient is φ = 607176.

The previous prime is 1821541. The next prime is 1821551. The reversal of 1821546 is 6451281.

It is an interprime number because it is at equal distance from previous prime (1821541) and next prime (1821551).

It can be written as a sum of positive squares in only one way, i.e., 1199025 + 622521 = 1095^2 + 789^2 .

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 (1821541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50581 + ... + 50616.

2^1821546 is an apocalyptic number.

1821546 is an abundant number, since it is smaller than the sum of its proper divisors (2125176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821546 is a wasteful number, since it uses less digits than its factorization.

1821546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101205 (or 101202 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1821546 is about 1349.6466204159. The cubic root of 1821546 is about 122.1274758219.

It can be divided in two parts, 182 and 1546, that added together give a cube (1728 = 12³).

The spelling of 1821546 in words is "one million, eight hundred twenty-one thousand, five hundred forty-six".