1998453 has 8 divisors (see below), whose sum is σ = 2682208. Its totient is φ = 1323504.

The previous prime is 1998449. The next prime is 1998457. The reversal of 1998453 is 3548991.

It is an interprime number because it is at equal distance from previous prime (1998449) and next prime (1998457).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998453 - 2² = 1998449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 2592.

It is an arithmetic number, because the mean of its divisors is an integer number (335276).

2^1998453 is an apocalyptic number.

It is an amenable number.

1998453 is a deficient number, since it is larger than the sum of its proper divisors (683755).

1998453 is a wasteful number, since it uses less digits than its factorization.

1998453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403.

The product of its digits is 38880, while the sum is 39.

The square root of 1998453 is about 1413.6665094710. Note that the first 3 decimals coincide. The cubic root of 1998453 is about 125.9596116458.

The spelling of 1998453 in words is "one million, nine hundred ninety-eight thousand, four hundred fifty-three".