1999648 has 48 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 838656.

The previous prime is 1999633. The next prime is 1999651. The reversal of 1999648 is 8469991.

It is a junction number, because it is equal to n+sod(n) for n = 1999598 and 1999607.

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, 17640 + ... + 17752.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2^1999648 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 1999648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298240).

1999648 is an abundant number, since it is smaller than the sum of its proper divisors (2596832).

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

1999648 is a wasteful number, since it uses less digits than its factorization.

1999648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 201 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 1999648 is about 1414.0891061033. The cubic root of 1999648 is about 125.9847130190.

The spelling of 1999648 in words is "one million, nine hundred ninety-nine thousand, six hundred forty-eight".