4639989 has 4 divisors (see below), whose sum is σ = 6186656. Its totient is φ = 3093324.

The previous prime is 4639979. The next prime is 4639993. The reversal of 4639989 is 9899364.

It is a happy number.

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 4639989 - 2¹² = 4635893 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4639909) 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, 773329 + ... + 773334.

It is an arithmetic number, because the mean of its divisors is an integer number (1546664).

Almost surely, 2^4639989 is an apocalyptic number.

It is an amenable number.

4639989 is a deficient number, since it is larger than the sum of its proper divisors (1546667).

4639989 is a wasteful number, since it uses less digits than its factorization.

4639989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546666.

The product of its digits is 419904, while the sum is 48.

The square root of 4639989 is about 2154.0633695414. The cubic root of 4639989 is about 166.7908865047.

The spelling of 4639989 in words is "four million, six hundred thirty-nine thousand, nine hundred eighty-nine".