3987996 has 48 divisors (see below), whose sum is σ = 9997344. Its totient is φ = 1232896.

The previous prime is 3987943. The next prime is 3988003. The reversal of 3987996 is 6997893.

It is a super-2 number, since 2×3987996² = 31808224192032, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22966 + ... + 23138.

It is an arithmetic number, because the mean of its divisors is an integer number (208278).

Almost surely, 2^3987996 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 3987996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4998672).

3987996 is an abundant number, since it is smaller than the sum of its proper divisors (6009348).

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

3987996 is a wasteful number, since it uses less digits than its factorization.

3987996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 308 counting only the distinct ones).

The product of its digits is 734832, while the sum is 51.

The square root of 3987996 is about 1996.9967451150. The cubic root of 3987996 is about 158.5811530669.

The spelling of 3987996 in words is "three million, nine hundred eighty-seven thousand, nine hundred ninety-six".