1821606 has 36 divisors (see below), whose sum is σ = 3982212. Its totient is φ = 555408.

The previous prime is 1821583. The next prime is 1821613. The reversal of 1821606 is 6061281.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 62800 + ... + 62828.

It is an arithmetic number, because the mean of its divisors is an integer number (110617).

2^1821606 is an apocalyptic number.

1821606 is an abundant number, since it is smaller than the sum of its proper divisors (2160606).

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

1821606 is a wasteful number, since it uses less digits than its factorization.

1821606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1821606 is about 1349.6688482735. The cubic root of 1821606 is about 122.1288167283.

Multiplying 1821606 by its sum of digits (24), we get a square (43718544 = 6612²).

Adding to 1821606 its reverse (6061281), we get a palindrome (7882887).

It can be divided in two parts, 182 and 1606, that multiplied together give a palindrome (292292).

The spelling of 1821606 in words is "one million, eight hundred twenty-one thousand, six hundred six".