398291 has 4 divisors (see below), whose sum is σ = 415632. Its totient is φ = 380952.

The previous prime is 398287. The next prime is 398303. The reversal of 398291 is 192893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192893 = 67 ⋅2879.

It is a cyclic number.

It is not a de Polignac number, because 398291 - 2² = 398287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398261) 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, 8636 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (103908).

2³⁹⁸²⁹¹ is an apocalyptic number.

398291 is a deficient number, since it is larger than the sum of its proper divisors (17341).

398291 is a wasteful number, since it uses less digits than its factorization.

398291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340.

The product of its digits is 3888, while the sum is 32.

The square root of 398291 is about 631.1030026866. The cubic root of 398291 is about 73.5755466771.

The spelling of 398291 in words is "three hundred ninety-eight thousand, two hundred ninety-one".