4639 has 2 divisors, whose sum is σ = 4640.
Its totient is φ = 4638.
The previous prime is 4637. The next prime is 4643. The reversal of 4639 is 9364.
It can be divided in two parts, 4 and 639, that multiplied together give a triangular number (2556 = T71).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 4639 - 21 = 4637 is a prime.
Together with 4637, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (4637) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319 + 2320.
It is an arithmetic number, because the mean of its divisors is an integer number (2320).
4639 is a deficient number, since it is larger than the sum of its proper divisors (1).
4639 is an equidigital number, since it uses as much as digits as its factorization.
4639 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 648, while the sum is 22.
The square root of 4639 is about 68.1102048154.
The cubic root of 4639 is about 16.6779035334.
The spelling of 4639 in words is "four thousand, six hundred thirty-nine".