4087989 has 12 divisors (see below), whose sum is σ = 6123936. Its totient is φ = 2725164.

The previous prime is 4087969. The next prime is 4087991. The reversal of 4087989 is 9897804.

It is not a de Polignac number, because 4087989 - 2⁵ = 4087957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4087949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8169 + ... + 8654.

It is an arithmetic number, because the mean of its divisors is an integer number (510328).

Almost surely, 2^4087989 is an apocalyptic number.

It is an amenable number.

4087989 is a deficient number, since it is larger than the sum of its proper divisors (2035947).

4087989 is an equidigital number, since it uses as much as digits as its factorization.

4087989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16838 (or 16826 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 4087989 is about 2021.8775927340. The cubic root of 4087989 is about 159.8956220267.

The spelling of 4087989 in words is "four million, eighty-seven thousand, nine hundred eighty-nine".