398109 has 8 divisors (see below), whose sum is σ = 535392. Its totient is φ = 263120.

The previous prime is 398087. The next prime is 398113. The reversal of 398109 is 901893.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398109 - 2⁵ = 398077 is a prime.

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 398109.

It is not an unprimeable number, because it can be changed into a prime (398119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114 + ... + 899.

It is an arithmetic number, because the mean of its divisors is an integer number (66924).

2³⁹⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

398109 is a deficient number, since it is larger than the sum of its proper divisors (137283).

398109 is a wasteful number, since it uses less digits than its factorization.

398109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 398109 is about 630.9587942172. The cubic root of 398109 is about 73.5643381305.

The spelling of 398109 in words is "three hundred ninety-eight thousand, one hundred nine".