3921996 has 48 divisors (see below), whose sum is σ = 10185728. Its totient is φ = 1166400.

The previous prime is 3921991. The next prime is 3921997. The reversal of 3921996 is 6991293.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (3921991) 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, 4431 + ... + 5241.

Almost surely, 2^3921996 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 3921996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5092864).

3921996 is an abundant number, since it is smaller than the sum of its proper divisors (6263732).

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

3921996 is a wasteful number, since it uses less digits than its factorization.

3921996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 860 counting only the distinct ones).

The product of its digits is 26244, while the sum is 39.

The square root of 3921996 is about 1980.4029892928. The cubic root of 3921996 is about 157.7014605160.

The spelling of 3921996 in words is "three million, nine hundred twenty-one thousand, nine hundred ninety-six".