1998903 has 4 divisors (see below), whose sum is σ = 2665208. Its totient is φ = 1332600.

The previous prime is 1998881. The next prime is 1998917. The reversal of 1998903 is 3098991.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1998903 - 2⁶ = 1998839 is a prime.

It is a super-2 number, since 2×1998903² = 7991226406818, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998923) 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, 333148 + ... + 333153.

It is an arithmetic number, because the mean of its divisors is an integer number (666302).

2^1998903 is an apocalyptic number.

1998903 is a deficient number, since it is larger than the sum of its proper divisors (666305).

1998903 is an equidigital number, since it uses as much as digits as its factorization.

1998903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666304.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1998903 is about 1413.8256611054. The cubic root of 1998903 is about 125.9690652200.

The spelling of 1998903 in words is "one million, nine hundred ninety-eight thousand, nine hundred three".