398285 has 4 divisors (see below), whose sum is σ = 477948. Its totient is φ = 318624.

The previous prime is 398273. The next prime is 398287. The reversal of 398285 is 582893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582893 = 31 ⋅18803.

It can be written as a sum of positive squares in 2 ways, for example, as 243049 + 155236 = 493^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 398285 - 2⁸ = 398029 is a prime.

It is a d-powerful number, because it can be written as 3 + 9⁴ + 2¹⁰ + 8 + 8² + 5⁸ .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398285.

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, 39824 + ... + 39833.

It is an arithmetic number, because the mean of its divisors is an integer number (119487).

2³⁹⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

398285 is a deficient number, since it is larger than the sum of its proper divisors (79663).

398285 is an equidigital number, since it uses as much as digits as its factorization.

398285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79662.

The product of its digits is 17280, while the sum is 35.

The square root of 398285 is about 631.0982490865. The cubic root of 398285 is about 73.5751772190.

The spelling of 398285 in words is "three hundred ninety-eight thousand, two hundred eighty-five".