1821008 has 40 divisors (see below), whose sum is σ = 4106880. Its totient is φ = 766080.

The previous prime is 1820999. The next prime is 1821013. The reversal of 1821008 is 8001281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7838 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (102672).

2^1821008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2053440).

1821008 is an abundant number, since it is smaller than the sum of its proper divisors (2285872).

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

1821008 is a wasteful number, since it uses less digits than its factorization.

1821008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1821008 is about 1349.4472942653. The cubic root of 1821008 is about 122.1154510451.

Adding to 1821008 its reverse (8001281), we get a palindrome (9822289).

The spelling of 1821008 in words is "one million, eight hundred twenty-one thousand, eight".