1998423 has 12 divisors (see below), whose sum is σ = 3299088. Its totient is φ = 1141920.

The previous prime is 1998413. The next prime is 1998427. The reversal of 1998423 is 3248991.

It is not a de Polignac number, because 1998423 - 2⁹ = 1997911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15798 + ... + 15923.

It is an arithmetic number, because the mean of its divisors is an integer number (274924).

2^1998423 is an apocalyptic number.

1998423 is a deficient number, since it is larger than the sum of its proper divisors (1300665).

1998423 is a wasteful number, since it uses less digits than its factorization.

1998423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31734 (or 31731 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1998423 is about 1413.6558987250. The cubic root of 1998423 is about 125.9589813570.

The spelling of 1998423 in words is "one million, nine hundred ninety-eight thousand, four hundred twenty-three".