4919989 has 2 divisors, whose sum is σ = 4919990. Its totient is φ = 4919988.

The previous prime is 4919983. The next prime is 4920023. The reversal of 4919989 is 9899194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4915089 + 4900 = 2217^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 4919989 - 2¹⁹ = 4395701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4919983) 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 as a sum of consecutive naturals, namely, 2459994 + 2459995.

It is an arithmetic number, because the mean of its divisors is an integer number (2459995).

Almost surely, 2^4919989 is an apocalyptic number.

It is an amenable number.

4919989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4919989 is an equidigital number, since it uses as much as digits as its factorization.

4919989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 49.

The square root of 4919989 is about 2218.1048216890. The cubic root of 4919989 is about 170.0805731089.

The spelling of 4919989 in words is "four million, nine hundred nineteen thousand, nine hundred eighty-nine".