398281 has 4 divisors (see below), whose sum is σ = 428932. Its totient is φ = 367632.

The previous prime is 398273. The next prime is 398287. The reversal of 398281 is 182893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 234256 + 164025 = 484^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 398281 - 2³ = 398273 is a prime.

It is a super-2 number, since 2×398281² = 317255509922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398287) 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, 15306 + ... + 15331.

It is an arithmetic number, because the mean of its divisors is an integer number (107233).

2³⁹⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

398281 is a deficient number, since it is larger than the sum of its proper divisors (30651).

398281 is a wasteful number, since it uses less digits than its factorization.

398281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30650.

The product of its digits is 3456, while the sum is 31.

The square root of 398281 is about 631.0950799998. The cubic root of 398281 is about 73.5749309116.

The spelling of 398281 in words is "three hundred ninety-eight thousand, two hundred eighty-one".