398321 has 12 divisors (see below), whose sum is σ = 506160. Its totient is φ = 309960.

The previous prime is 398311. The next prime is 398323. The reversal of 398321 is 123893.

It is not a de Polignac number, because 398321 - 2¹⁰ = 397297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170 + ... + 908.

It is an arithmetic number, because the mean of its divisors is an integer number (42180).

2³⁹⁸³²¹ is an apocalyptic number.

It is an amenable number.

398321 is a deficient number, since it is larger than the sum of its proper divisors (107839).

398321 is a wasteful number, since it uses less digits than its factorization.

398321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 757 counting only the distinct ones).

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

The square root of 398321 is about 631.1267701500. The cubic root of 398321 is about 73.5773939119.

It can be divided in two parts, 3983 and 21, that added together give a palindrome (4004).

The spelling of 398321 in words is "three hundred ninety-eight thousand, three hundred twenty-one".