3987081 has 18 divisors (see below), whose sum is σ = 6700122. Its totient is φ = 2278080.

The previous prime is 3987079. The next prime is 3987107. The reversal of 3987081 is 1807893.

It can be written as a sum of positive squares in only one way, i.e., 3980025 + 7056 = 1995^2 + 84^2 .

It is not a de Polignac number, because 3987081 - 2¹ = 3987079 is a prime.

It is a super-2 number, since 2×3987081² = 31793629801122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3987001) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4080 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (372229).

Almost surely, 2^3987081 is an apocalyptic number.

It is an amenable number.

3987081 is a deficient number, since it is larger than the sum of its proper divisors (2713041).

3987081 is a wasteful number, since it uses less digits than its factorization.

3987081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9061 (or 9051 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 3987081 is about 1996.7676379589. The cubic root of 3987081 is about 158.5690239296.

The spelling of 3987081 in words is "three million, nine hundred eighty-seven thousand, eighty-one".