4028989 has 6 divisors (see below), whose sum is σ = 4111034. Its totient is φ = 3947520.

The previous prime is 4028987. The next prime is 4028993. The reversal of 4028989 is 9898204.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1876900 + 2152089 = 1370^2 + 1467^2 .

It is not a de Polignac number, because 4028989 - 2¹ = 4028987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4028987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15549 + ... + 15805.

Almost surely, 2^4028989 is an apocalyptic number.

It is an amenable number.

4028989 is a deficient number, since it is larger than the sum of its proper divisors (82045).

4028989 is an frugal number, since it uses more digits than its factorization.

4028989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 4028989 is about 2007.2341667080. The cubic root of 4028989 is about 159.1226589347.

The spelling of 4028989 in words is "four million, twenty-eight thousand, nine hundred eighty-nine".