1998003 has 8 divisors (see below), whose sum is σ = 3044608. Its totient is φ = 1141704.

The previous prime is 1997999. The next prime is 1998019. The reversal of 1998003 is 3008991.

It is a happy number.

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

It is not a de Polignac number, because 1998003 - 2² = 1997999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998023) 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, 47551 + ... + 47592.

It is an arithmetic number, because the mean of its divisors is an integer number (380576).

2^1998003 is an apocalyptic number.

1998003 is a deficient number, since it is larger than the sum of its proper divisors (1046605).

1998003 is an equidigital number, since it uses as much as digits as its factorization.

1998003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95153.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1998003 is about 1413.5073399173. The cubic root of 1998003 is about 125.9501566523.

The spelling of 1998003 in words is "one million, nine hundred ninety-eight thousand, three".