398823 has 8 divisors (see below), whose sum is σ = 546288. Its totient is φ = 258624.

The previous prime is 398821. The next prime is 398833. The reversal of 398823 is 328893.

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

It is not a de Polignac number, because 398823 - 2¹ = 398821 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (68286).

2³⁹⁸⁸²³ is an apocalyptic number.

398823 is a deficient number, since it is larger than the sum of its proper divisors (147465).

398823 is a wasteful number, since it uses less digits than its factorization.

398823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633.

The product of its digits is 10368, while the sum is 33.

The square root of 398823 is about 631.5243463240. The cubic root of 398823 is about 73.6082905555.

It can be divided in two parts, 398 and 823, that added together give a palindrome (1221).

The spelling of 398823 in words is "three hundred ninety-eight thousand, eight hundred twenty-three".