1999968 has 48 divisors (see below), whose sum is σ = 5334336. Its totient is φ = 656000.

The previous prime is 1999957. The next prime is 1999969. The reversal of 1999968 is 8699991.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1999968.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7843 + ... + 8093.

It is an arithmetic number, because the mean of its divisors is an integer number (111132).

2^1999968 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 1999968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667168).

1999968 is an abundant number, since it is smaller than the sum of its proper divisors (3334368).

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

1999968 is a wasteful number, since it uses less digits than its factorization.

1999968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 339 counting only the distinct ones).

The product of its digits is 314928, while the sum is 51.

The square root of 1999968 is about 1414.2022486193. The cubic root of 1999968 is about 125.9914330280.

The spelling of 1999968 in words is "one million, nine hundred ninety-nine thousand, nine hundred sixty-eight".