4491639 has 8 divisors (see below), whose sum is σ = 6654320. Its totient is φ = 2994408.

The previous prime is 4491631. The next prime is 4491653. The reversal of 4491639 is 9361944.

It is not a de Polignac number, because 4491639 - 2³ = 4491631 is a prime.

It is a Duffinian number.

4491639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4491631) 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 7 ways as a sum of consecutive naturals, for example, 83152 + ... + 83205.

It is an arithmetic number, because the mean of its divisors is an integer number (831790).

Almost surely, 2^4491639 is an apocalyptic number.

4491639 is a deficient number, since it is larger than the sum of its proper divisors (2162681).

4491639 is a wasteful number, since it uses less digits than its factorization.

4491639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166366 (or 166360 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 4491639 is about 2119.3487207159. The cubic root of 4491639 is about 164.9940493722.

The spelling of 4491639 in words is "four million, four hundred ninety-one thousand, six hundred thirty-nine".