3990996 has 36 divisors (see below), whose sum is σ = 10264800. Its totient is φ = 1307088.

The previous prime is 3990979. The next prime is 3990997. The reversal of 3990996 is 6990993.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1185 + ... + 3063.

Almost surely, 2^3990996 is an apocalyptic number.

3990996 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3990996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5132400).

3990996 is an abundant number, since it is smaller than the sum of its proper divisors (6273804).

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

3990996 is a wasteful number, since it uses less digits than its factorization.

3990996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 3990996 is about 1997.7477318220. The cubic root of 3990996 is about 158.6209077219.

The spelling of 3990996 in words is "three million, nine hundred ninety thousand, nine hundred ninety-six".