3987944 has 8 divisors (see below), whose sum is σ = 7477410. Its totient is φ = 1993968.

The previous prime is 3987943. The next prime is 3988003. The reversal of 3987944 is 4497893.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 925444 = 1750^2 + 962^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 3987895 and 3987904.

It is not an unprimeable number, because it can be changed into a prime (3987943) 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 as a sum of consecutive naturals, namely, 249239 + ... + 249254.

Almost surely, 2^3987944 is an apocalyptic number.

It is an amenable number.

3987944 is a deficient number, since it is larger than the sum of its proper divisors (3489466).

3987944 is a wasteful number, since it uses less digits than its factorization.

3987944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498499 (or 498495 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 3987944 is about 1996.9837255221. The cubic root of 3987944 is about 158.5804638105.

The spelling of 3987944 in words is "three million, nine hundred eighty-seven thousand, nine hundred forty-four".