3987320 has 32 divisors (see below), whose sum is σ = 9087120. Its totient is φ = 1574400.

The previous prime is 3987317. The next prime is 3987323. The reversal of 3987320 is 237893.

It is an interprime number because it is at equal distance from previous prime (3987317) and next prime (3987323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 3920.

Almost surely, 2^3987320 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 3987320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4543560).

3987320 is an abundant number, since it is smaller than the sum of its proper divisors (5099800).

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

3987320 is a wasteful number, since it uses less digits than its factorization.

3987320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 3987320 is about 1996.8274837852. The cubic root of 3987320 is about 158.5721922658.

It can be divided in two parts, 39873 and 20, that added together give a palindrome (39893).

The spelling of 3987320 in words is "three million, nine hundred eighty-seven thousand, three hundred twenty".