4991839 has 2 divisors, whose sum is σ = 4991840. Its totient is φ = 4991838.

The previous prime is 4991803. The next prime is 4991843. The reversal of 4991839 is 9381994.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4991839 - 2¹³ = 4983647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4991795 and 4991804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4991849) 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 as a sum of consecutive naturals, namely, 2495919 + 2495920.

It is an arithmetic number, because the mean of its divisors is an integer number (2495920).

Almost surely, 2^4991839 is an apocalyptic number.

4991839 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991839 is an equidigital number, since it uses as much as digits as its factorization.

4991839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 4991839 is about 2234.2423771829. The cubic root of 4991839 is about 170.9045099136.

The spelling of 4991839 in words is "four million, nine hundred ninety-one thousand, eight hundred thirty-nine".