1821608 has 16 divisors (see below), whose sum is σ = 3448500. Its totient is φ = 902016.

The previous prime is 1821583. The next prime is 1821613. The reversal of 1821608 is 8061281.

It can be written as a sum of positive squares in 2 ways, for example, as 1643524 + 178084 = 1282^2 + 422^2 .

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 1916.

2^1821608 is an apocalyptic number.

It is an amenable number.

1821608 is a deficient number, since it is larger than the sum of its proper divisors (1626892).

1821608 is a wasteful number, since it uses less digits than its factorization.

1821608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 1821608 is about 1349.6695891958. The cubic root of 1821608 is about 122.1288614246.

Adding to 1821608 its reverse (8061281), we get a palindrome (9882889).

The spelling of 1821608 in words is "one million, eight hundred twenty-one thousand, six hundred eight".