398123 has 8 divisors (see below), whose sum is σ = 460080. Its totient is φ = 340480.

The previous prime is 398119. The next prime is 398129. The reversal of 398123 is 321893.

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

It is a cyclic number.

It is not a de Polignac number, because 398123 - 2² = 398119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398092 and 398101.

It is not an unprimeable number, because it can be changed into a prime (398129) 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, 878 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (57510).

2³⁹⁸¹²³ is an apocalyptic number.

398123 is a deficient number, since it is larger than the sum of its proper divisors (61957).

398123 is a wasteful number, since it uses less digits than its factorization.

398123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157.

The product of its digits is 1296, while the sum is 26.

The square root of 398123 is about 630.9698883465. The cubic root of 398123 is about 73.5652004477.

It can be divided in two parts, 3981 and 23, that added together give a palindrome (4004).

The spelling of 398123 in words is "three hundred ninety-eight thousand, one hundred twenty-three".