1998193 has 4 divisors (see below), whose sum is σ = 2001520. Its totient is φ = 1994868.

The previous prime is 1998181. The next prime is 1998209. The reversal of 1998193 is 3918991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3918991 = 1741 ⋅2251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 483 + ... + 2056.

It is an arithmetic number, because the mean of its divisors is an integer number (500380).

2^1998193 is an apocalyptic number.

It is an amenable number.

1998193 is a deficient number, since it is larger than the sum of its proper divisors (3327).

1998193 is an equidigital number, since it uses as much as digits as its factorization.

1998193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326.

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

The square root of 1998193 is about 1413.5745470261. The cubic root of 1998193 is about 125.9541489338.

The spelling of 1998193 in words is "one million, nine hundred ninety-eight thousand, one hundred ninety-three".