4007989 has 4 divisors (see below), whose sum is σ = 4030560. Its totient is φ = 3985420.

The previous prime is 4007981. The next prime is 4007999. The reversal of 4007989 is 9897004.

It is a happy number.

4007989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 4007989 - 2³ = 4007981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4007981) 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 3 ways as a sum of consecutive naturals, for example, 11017 + ... + 11374.

It is an arithmetic number, because the mean of its divisors is an integer number (1007640).

Almost surely, 2^4007989 is an apocalyptic number.

It is an amenable number.

4007989 is a deficient number, since it is larger than the sum of its proper divisors (22571).

4007989 is a wasteful number, since it uses less digits than its factorization.

4007989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22570.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 4007989 is about 2001.9962537427. The cubic root of 4007989 is about 158.8457161425.

The spelling of 4007989 in words is "four million, seven thousand, nine hundred eighty-nine".