4639823 has 2 divisors, whose sum is σ = 4639824. Its totient is φ = 4639822.

The previous prime is 4639799. The next prime is 4639849. The reversal of 4639823 is 3289364.

It is a happy number.

4639823 is nontrivially palindromic in base 9.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4639823 - 2¹⁶ = 4574287 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4639853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319911 + 2319912.

It is an arithmetic number, because the mean of its divisors is an integer number (2319912).

Almost surely, 2^4639823 is an apocalyptic number.

4639823 is a deficient number, since it is larger than the sum of its proper divisors (1).

4639823 is an equidigital number, since it uses as much as digits as its factorization.

4639823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 4639823 is about 2154.0248373684. The cubic root of 4639823 is about 166.7888974470.

It can be divided in two parts, 463982 and 3, that multiplied together give a triangular number (1391946 = T₁₆₆₈).

The spelling of 4639823 in words is "four million, six hundred thirty-nine thousand, eight hundred twenty-three".