3987280 has 80 divisors (see below), whose sum is σ = 10606464. Its totient is φ = 1379840.

The previous prime is 3987271. The next prime is 3987287. The reversal of 3987280 is 827893.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987287) 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, 20142 + ... + 20338.

Almost surely, 2^3987280 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 3987280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5303232).

3987280 is an abundant number, since it is smaller than the sum of its proper divisors (6619184).

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

3987280 is a wasteful number, since it uses less digits than its factorization.

3987280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 3987280 is about 1996.8174678723. The cubic root of 3987280 is about 158.5716620092.

The spelling of 3987280 in words is "three million, nine hundred eighty-seven thousand, two hundred eighty".