1998773 has 4 divisors (see below), whose sum is σ = 2284320. Its totient is φ = 1713228.

The previous prime is 1998761. The next prime is 1998793. The reversal of 1998773 is 3778991.

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: 3778991 = 73 ⋅51767.

It is a cyclic number.

It is not a de Polignac number, because 1998773 - 2⁸ = 1998517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998793) 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, 142763 + ... + 142776.

It is an arithmetic number, because the mean of its divisors is an integer number (571080).

2^1998773 is an apocalyptic number.

It is an amenable number.

1998773 is a deficient number, since it is larger than the sum of its proper divisors (285547).

1998773 is an equidigital number, since it uses as much as digits as its factorization.

1998773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285546.

The product of its digits is 95256, while the sum is 44.

The square root of 1998773 is about 1413.7796858068. The cubic root of 1998773 is about 125.9663343332.

The spelling of 1998773 in words is "one million, nine hundred ninety-eight thousand, seven hundred seventy-three".