3997992 has 64 divisors (see below), whose sum is σ = 10886400. Its totient is φ = 1218560.

The previous prime is 3997979. The next prime is 3997993. The reversal of 3997992 is 2997993.

It is a happy number.

3997992 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (3997993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16609 + ... + 16847.

It is an arithmetic number, because the mean of its divisors is an integer number (170100).

Almost surely, 2^3997992 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 3997992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5443200).

3997992 is an abundant number, since it is smaller than the sum of its proper divisors (6888408).

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

3997992 is a wasteful number, since it uses less digits than its factorization.

3997992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 302 counting only the distinct ones).

The product of its digits is 275562, while the sum is 48.

The square root of 3997992 is about 1999.4979369832. The cubic root of 3997992 is about 158.7135382399.

Subtracting from 3997992 its reverse (2997993), we obtain a palindrome (999999).

The spelling of 3997992 in words is "three million, nine hundred ninety-seven thousand, nine hundred ninety-two".