1988839 has 2 divisors, whose sum is σ = 1988840. Its totient is φ = 1988838.

The previous prime is 1988837. The next prime is 1988843. The reversal of 1988839 is 9388891.

It is a weak prime.

It is an emirp because it is prime and its reverse (9388891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988839 - 2¹ = 1988837 is a prime.

Together with 1988837, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988837) 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, 994419 + 994420.

It is an arithmetic number, because the mean of its divisors is an integer number (994420).

2^1988839 is an apocalyptic number.

1988839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988839 is an equidigital number, since it uses as much as digits as its factorization.

1988839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 1988839 is about 1410.2620323897. The cubic root of 1988839 is about 125.7573013585.

The spelling of 1988839 in words is "one million, nine hundred eighty-eight thousand, eight hundred thirty-nine".