4387989 has 16 divisors (see below), whose sum is σ = 6265728. Its totient is φ = 2721792.

The previous prime is 4387987. The next prime is 4387991. The reversal of 4387989 is 9897834.

It is an interprime number because it is at equal distance from previous prime (4387987) and next prime (4387991).

It is not a de Polignac number, because 4387989 - 2¹ = 4387987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4387987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4504 + ... + 5390.

It is an arithmetic number, because the mean of its divisors is an integer number (391608).

Almost surely, 2^4387989 is an apocalyptic number.

It is an amenable number.

4387989 is a deficient number, since it is larger than the sum of its proper divisors (1877739).

4387989 is a wasteful number, since it uses less digits than its factorization.

4387989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004.

The product of its digits is 435456, while the sum is 48.

The square root of 4387989 is about 2094.7527300376. The cubic root of 4387989 is about 163.7150141833.

The spelling of 4387989 in words is "four million, three hundred eighty-seven thousand, nine hundred eighty-nine".