3987812 has 6 divisors (see below), whose sum is σ = 6978678. Its totient is φ = 1993904.

The previous prime is 3987811. The next prime is 3987821. The reversal of 3987812 is 2187893.

It can be written as a sum of positive squares in only one way, i.e., 2390116 + 1597696 = 1546^2 + 1264^2 .

It is not an unprimeable number, because it can be changed into a prime (3987811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498473 + ... + 498480.

It is an arithmetic number, because the mean of its divisors is an integer number (1163113).

Almost surely, 2^3987812 is an apocalyptic number.

It is an amenable number.

3987812 is a deficient number, since it is larger than the sum of its proper divisors (2990866).

3987812 is a wasteful number, since it uses less digits than its factorization.

3987812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996957 (or 996955 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 3987812 is about 1996.9506754049. The cubic root of 3987812 is about 158.5787141326.

The spelling of 3987812 in words is "three million, nine hundred eighty-seven thousand, eight hundred twelve".