398181 has 16 divisors (see below), whose sum is σ = 617984. Its totient is φ = 223344.

The previous prime is 398171. The next prime is 398207. The reversal of 398181 is 181893.

398181 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 398181 - 2⁵ = 398149 is a prime.

It is a super-2 number, since 2×398181² = 317096217522, which contains 22 as substring.

It is a Duffinian number.

398181 is strictly pandigital in base 7.

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 398181.

It is not an unprimeable number, because it can be changed into a prime (398171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (38624).

2³⁹⁸¹⁸¹ is an apocalyptic number.

It is an amenable number.

398181 is a deficient number, since it is larger than the sum of its proper divisors (219803).

398181 is a wasteful number, since it uses less digits than its factorization.

398181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its digits is 1728, while the sum is 30.

The square root of 398181 is about 631.0158476615. The cubic root of 398181 is about 73.5687726891.

The spelling of 398181 in words is "three hundred ninety-eight thousand, one hundred eighty-one".