3987642 has 16 divisors (see below), whose sum is σ = 8004672. Its totient is φ = 1324320.

The previous prime is 3987629. The next prime is 3987649. The reversal of 3987642 is 2467893.

It is a super-4 number, since 4×3987642⁴ (a number of 28 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3987642.

It is not an unprimeable number, because it can be changed into a prime (3987649) 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 7 ways as a sum of consecutive naturals, for example, 798 + ... + 2934.

It is an arithmetic number, because the mean of its divisors is an integer number (500292).

Almost surely, 2^3987642 is an apocalyptic number.

3987642 is an abundant number, since it is smaller than the sum of its proper divisors (4017030).

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

3987642 is a wasteful number, since it uses less digits than its factorization.

3987642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453.

The product of its digits is 72576, while the sum is 39.

The square root of 3987642 is about 1996.9081100541. The cubic root of 3987642 is about 158.5764607027.

The spelling of 3987642 in words is "three million, nine hundred eighty-seven thousand, six hundred forty-two".