3889987 has 4 divisors (see below), whose sum is σ = 3894640. Its totient is φ = 3885336.

The previous prime is 3889969. The next prime is 3889993. The reversal of 3889987 is 7899883.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7899883 = 17 ⋅464699.

It is a cyclic number.

It is not a de Polignac number, because 3889987 - 2⁷ = 3889859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3889937) 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 3 ways as a sum of consecutive naturals, for example, 687 + ... + 2872.

It is an arithmetic number, because the mean of its divisors is an integer number (973660).

Almost surely, 2^3889987 is an apocalyptic number.

3889987 is a deficient number, since it is larger than the sum of its proper divisors (4653).

3889987 is a wasteful number, since it uses less digits than its factorization.

3889987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652.

The product of its digits is 870912, while the sum is 52.

The square root of 3889987 is about 1972.3049966980. The cubic root of 3889987 is about 157.2712661952.

The spelling of 3889987 in words is "three million, eight hundred eighty-nine thousand, nine hundred eighty-seven".