1998241 has 4 divisors (see below), whose sum is σ = 2283712. Its totient is φ = 1712772.

The previous prime is 1998233. The next prime is 1998251. The reversal of 1998241 is 1428991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1998241 - 2³ = 1998233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1998197 and 1998206.

It is not an unprimeable number, because it can be changed into a prime (1998221) 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 in 3 ways as a sum of consecutive naturals, for example, 142725 + ... + 142738.

It is an arithmetic number, because the mean of its divisors is an integer number (570928).

2^1998241 is an apocalyptic number.

It is an amenable number.

1998241 is a deficient number, since it is larger than the sum of its proper divisors (285471).

1998241 is an equidigital number, since it uses as much as digits as its factorization.

1998241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285470.

The product of its digits is 5184, while the sum is 34.

The square root of 1998241 is about 1413.5915251585. The cubic root of 1998241 is about 125.9551574701.

The spelling of 1998241 in words is "one million, nine hundred ninety-eight thousand, two hundred forty-one".