1998443 has 2 divisors, whose sum is σ = 1998444. Its totient is φ = 1998442.

The previous prime is 1998431. The next prime is 1998449. The reversal of 1998443 is 3448991.

It is a strong prime.

1998443 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 1998443 - 2⁴ = 1998427 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1998397 and 1998406.

It is not a weakly prime, because it can be changed into another prime (1998449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999221 + 999222.

It is an arithmetic number, because the mean of its divisors is an integer number (999222).

2^1998443 is an apocalyptic number.

1998443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998443 is an equidigital number, since it uses as much as digits as its factorization.

1998443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The square root of 1998443 is about 1413.6629725645. The cubic root of 1998443 is about 125.9594015502.

The spelling of 1998443 in words is "one million, nine hundred ninety-eight thousand, four hundred forty-three".