1998992 has 20 divisors (see below), whose sum is σ = 3914556. Its totient is φ = 988800.

The previous prime is 1998991. The next prime is 1999007. The reversal of 1998992 is 2998991.

1998992 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1752976 + 246016 = 1324^2 + 496^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1998991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998 + ... + 2234.

2^1998992 is an apocalyptic number.

It is an amenable number.

1998992 is a deficient number, since it is larger than the sum of its proper divisors (1915564).

1998992 is a wasteful number, since it uses less digits than its factorization.

1998992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346 (or 1340 counting only the distinct ones).

The product of its digits is 104976, while the sum is 47.

The square root of 1998992 is about 1413.8571356399. The cubic root of 1998992 is about 125.9709347589.

Subtracting 1998992 from its reverse (2998991), we obtain a palindrome (999999).

The spelling of 1998992 in words is "one million, nine hundred ninety-eight thousand, nine hundred ninety-two".