398243 has 4 divisors (see below), whose sum is σ = 402288. Its totient is φ = 394200.

The previous prime is 398227. The next prime is 398249. The reversal of 398243 is 342893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342893 = 19 ⋅18047.

It is a cyclic number.

It is not a de Polignac number, because 398243 - 2⁴ = 398227 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398249) 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, 1871 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (100572).

2³⁹⁸²⁴³ is an apocalyptic number.

398243 is a deficient number, since it is larger than the sum of its proper divisors (4045).

398243 is a wasteful number, since it uses less digits than its factorization.

398243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044.

The product of its digits is 5184, while the sum is 29.

The square root of 398243 is about 631.0649728831. The cubic root of 398243 is about 73.5725909085.

The spelling of 398243 in words is "three hundred ninety-eight thousand, two hundred forty-three".