1821696 has 44 divisors (see below), whose sum is σ = 4863672. Its totient is φ = 606208.

The previous prime is 1821691. The next prime is 1821707. The reversal of 1821696 is 6961281.

It is not an unprimeable number, because it can be changed into a prime (1821691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776 + ... + 3368.

It is an arithmetic number, because the mean of its divisors is an integer number (110538).

2^1821696 is an apocalyptic number.

1821696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2431836).

1821696 is an abundant number, since it is smaller than the sum of its proper divisors (3041976).

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

1821696 is an equidigital number, since it uses as much as digits as its factorization.

1821696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 598 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 1821696 is about 1349.7021893736. The cubic root of 1821696 is about 122.1308280327.

The spelling of 1821696 in words is "one million, eight hundred twenty-one thousand, six hundred ninety-six".