398003 has 4 divisors (see below), whose sum is σ = 399288. Its totient is φ = 396720.

The previous prime is 397981. The next prime is 398011. The reversal of 398003 is 300893.

Added to its reverse (300893) it gives a square (698896 = 836²).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 398003 - 2⁶ = 397939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398003.

It is not an unprimeable number, because it can be changed into a prime (398023) 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, 143 + ... + 903.

It is an arithmetic number, because the mean of its divisors is an integer number (99822).

2³⁹⁸⁰⁰³ is an apocalyptic number.

398003 is a deficient number, since it is larger than the sum of its proper divisors (1285).

398003 is an equidigital number, since it uses as much as digits as its factorization.

398003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 398003 is about 630.8747894789. The cubic root of 398003 is about 73.5578085017.

Adding to 398003 its reverse (300893), we get a palindrome (698896).

The spelling of 398003 in words is "three hundred ninety-eight thousand, three".