1998273 has 4 divisors (see below), whose sum is σ = 2664368. Its totient is φ = 1332180.

The previous prime is 1998257. The next prime is 1998277. The reversal of 1998273 is 3728991.

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 not a de Polignac number, because 1998273 - 2⁴ = 1998257 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998277) 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, 333043 + ... + 333048.

It is an arithmetic number, because the mean of its divisors is an integer number (666092).

2^1998273 is an apocalyptic number.

It is an amenable number.

1998273 is a deficient number, since it is larger than the sum of its proper divisors (666095).

1998273 is an equidigital number, since it uses as much as digits as its factorization.

1998273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666094.

The product of its digits is 27216, while the sum is 39.

The square root of 1998273 is about 1413.6028438002. The cubic root of 1998273 is about 125.9558298187.

The spelling of 1998273 in words is "one million, nine hundred ninety-eight thousand, two hundred seventy-three".