1644996 has 36 divisors (see below), whose sum is σ = 3999632. Its totient is φ = 526176.

The previous prime is 1644991. The next prime is 1644997. The reversal of 1644996 is 6994461.

It is a Smith number, since the sum of its digits (39) 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 (1644991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10011 + ... + 10173.

2^1644996 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 1644996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999816).

1644996 is an abundant number, since it is smaller than the sum of its proper divisors (2354636).

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

1644996 is a wasteful number, since it uses less digits than its factorization.

1644996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 197 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 1644996 is about 1282.5739744748. The cubic root of 1644996 is about 118.0469984191.

The spelling of 1644996 in words is "one million, six hundred forty-four thousand, nine hundred ninety-six".