4538639 has 4 divisors (see below), whose sum is σ = 5187024. Its totient is φ = 3890256.

The previous prime is 4538627. The next prime is 4538641. The reversal of 4538639 is 9368354.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9368354 = 2 ⋅4684177.

It is a cyclic number.

It is not a de Polignac number, because 4538639 - 2¹⁶ = 4473103 is a prime.

It is a super-3 number, since 3×4538639³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4538669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324182 + ... + 324195.

It is an arithmetic number, because the mean of its divisors is an integer number (1296756).

Almost surely, 2^4538639 is an apocalyptic number.

4538639 is a deficient number, since it is larger than the sum of its proper divisors (648385).

4538639 is an equidigital number, since it uses as much as digits as its factorization.

4538639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648384.

The product of its digits is 77760, while the sum is 38.

The square root of 4538639 is about 2130.4081768525. The cubic root of 4538639 is about 165.5675466560.

The spelling of 4538639 in words is "four million, five hundred thirty-eight thousand, six hundred thirty-nine".