398885 has 4 divisors (see below), whose sum is σ = 478668. Its totient is φ = 319104.

The previous prime is 398863. The next prime is 398887. The reversal of 398885 is 588893.

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 264196 + 134689 = 514^2 + 367^2 .

It is a cyclic number.

It is not a de Polignac number, because 398885 - 2⁶ = 398821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398887) 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, 39884 + ... + 39893.

It is an arithmetic number, because the mean of its divisors is an integer number (119667).

2³⁹⁸⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

398885 is a deficient number, since it is larger than the sum of its proper divisors (79783).

398885 is an equidigital number, since it uses as much as digits as its factorization.

398885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79782.

The product of its digits is 69120, while the sum is 41.

The square root of 398885 is about 631.5734319935. The cubic root of 398885 is about 73.6121046765.

It can be divided in two parts, 39888 and 5, that added together give a palindrome (39893).

The spelling of 398885 in words is "three hundred ninety-eight thousand, eight hundred eighty-five".