4188989 has 4 divisors (see below), whose sum is σ = 4787424. Its totient is φ = 3590556.

The previous prime is 4188973. The next prime is 4188991. The reversal of 4188989 is 9898814.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9898814 = 2 ⋅4949407.

It is a cyclic number.

It is not a de Polignac number, because 4188989 - 2⁴ = 4188973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4188089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299207 + ... + 299220.

It is an arithmetic number, because the mean of its divisors is an integer number (1196856).

Almost surely, 2^4188989 is an apocalyptic number.

It is an amenable number.

4188989 is a deficient number, since it is larger than the sum of its proper divisors (598435).

4188989 is an equidigital number, since it uses as much as digits as its factorization.

4188989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598434.

The product of its digits is 165888, while the sum is 47.

The square root of 4188989 is about 2046.7019812371. The cubic root of 4188989 is about 161.2017454714.

The spelling of 4188989 in words is "four million, one hundred eighty-eight thousand, nine hundred eighty-nine".