398065 has 4 divisors (see below), whose sum is σ = 477684. Its totient is φ = 318448.

The previous prime is 398063. The next prime is 398077. The reversal of 398065 is 560893.

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 42849 + 355216 = 207^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 398065 - 2¹ = 398063 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398063) 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, 39802 + ... + 39811.

It is an arithmetic number, because the mean of its divisors is an integer number (119421).

2³⁹⁸⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

398065 is a deficient number, since it is larger than the sum of its proper divisors (79619).

398065 is an equidigital number, since it uses as much as digits as its factorization.

398065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79618.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 398065 is about 630.9239256836. The cubic root of 398065 is about 73.5616278593.

The spelling of 398065 in words is "three hundred ninety-eight thousand, sixty-five".