398841 has 4 divisors (see below), whose sum is σ = 531792. Its totient is φ = 265892.

The previous prime is 398833. The next prime is 398857. The reversal of 398841 is 148893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398841 - 2³ = 398833 is a prime.

It is a D-number.

398841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (398821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66471 + ... + 66476.

It is an arithmetic number, because the mean of its divisors is an integer number (132948).

2³⁹⁸⁸⁴¹ is an apocalyptic number.

It is an amenable number.

398841 is a deficient number, since it is larger than the sum of its proper divisors (132951).

398841 is a wasteful number, since it uses less digits than its factorization.

398841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132950.

The product of its digits is 6912, while the sum is 33.

The square root of 398841 is about 631.5385973953. The cubic root of 398841 is about 73.6093979217.

The spelling of 398841 in words is "three hundred ninety-eight thousand, eight hundred forty-one".