1998319 has 2 divisors, whose sum is σ = 1998320. Its totient is φ = 1998318.

The previous prime is 1998301. The next prime is 1998329. The reversal of 1998319 is 9138991.

It is a strong prime.

It is an emirp because it is prime and its reverse (9138991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998319 is a prime.

It is a super-2 number, since 2×1998319² = 7986557651522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999159 + 999160.

It is an arithmetic number, because the mean of its divisors is an integer number (999160).

2^1998319 is an apocalyptic number.

1998319 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998319 is an equidigital number, since it uses as much as digits as its factorization.

1998319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 1998319 is about 1413.6191141888. The cubic root of 1998319 is about 125.9567963072.

It can be divided in two parts, 19983 and 19, that added together give a palindrome (20002).

The spelling of 1998319 in words is "one million, nine hundred ninety-eight thousand, three hundred nineteen".