398663 has 8 divisors (see below), whose sum is σ = 421200. Its totient is φ = 376768.

The previous prime is 398627. The next prime is 398669. The reversal of 398663 is 366893.

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

It is not a de Polignac number, because 398663 - 2⁸ = 398407 is a prime.

It is a d-powerful number, because it can be written as 3¹⁰ + 9² + 6² + 8³ + 6⁷ + 3¹⁰ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398669) 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, 1595 + ... + 1827.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2³⁹⁸⁶⁶³ is an apocalyptic number.

398663 is a deficient number, since it is larger than the sum of its proper divisors (22537).

398663 is a wasteful number, since it uses less digits than its factorization.

398663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its digits is 23328, while the sum is 35.

The square root of 398663 is about 631.3976559982. The cubic root of 398663 is about 73.5984458360.

The spelling of 398663 in words is "three hundred ninety-eight thousand, six hundred sixty-three".