4000989 has 4 divisors (see below), whose sum is σ = 5334656. Its totient is φ = 2667324.

The previous prime is 4000987. The next prime is 4000993. The reversal of 4000989 is 9890004.

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 not a de Polignac number, because 4000989 - 2¹ = 4000987 is a prime.

It is a D-number.

It is a Duffinian number.

4000989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000987) 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, 666829 + ... + 666834.

It is an arithmetic number, because the mean of its divisors is an integer number (1333664).

Almost surely, 2^4000989 is an apocalyptic number.

It is an amenable number.

4000989 is a deficient number, since it is larger than the sum of its proper divisors (1333667).

4000989 is a wasteful number, since it uses less digits than its factorization.

4000989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333666.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 4000989 is about 2000.2472347187. The cubic root of 4000989 is about 158.7531869491.

The spelling of 4000989 in words is "four million, nine hundred eighty-nine", and thus it is an aban number.