3999968 has 36 divisors (see below), whose sum is σ = 9164232. Its totient is φ = 1713600.

The previous prime is 3999949. The next prime is 3999971. The reversal of 3999968 is 8699993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293 + ... + 2843.

It is an arithmetic number, because the mean of its divisors is an integer number (254562).

Almost surely, 2^3999968 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 3999968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4582116).

3999968 is an abundant number, since it is smaller than the sum of its proper divisors (5164264).

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

3999968 is a wasteful number, since it uses less digits than its factorization.

3999968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2560 counting only the distinct ones).

The product of its digits is 944784, while the sum is 53.

The square root of 3999968 is about 1999.9919999840. The cubic root of 3999968 is about 158.7396818887.

It can be divided in two parts, 399996 and 8, that added together give a palindrome (400004).

The spelling of 3999968 in words is "three million, nine hundred ninety-nine thousand, nine hundred sixty-eight".