398009 has 8 divisors (see below), whose sum is σ = 423168. Its totient is φ = 373680.

The previous prime is 397981. The next prime is 398011. The reversal of 398009 is 900893.

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 398009 - 2⁸ = 397753 is a prime.

It is a super-2 number, since 2×398009² = 316822328162, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (398029) 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, 974 + ... + 1320.

It is an arithmetic number, because the mean of its divisors is an integer number (52896).

2³⁹⁸⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

398009 is a deficient number, since it is larger than the sum of its proper divisors (25159).

398009 is a wasteful number, since it uses less digits than its factorization.

398009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 398009 is about 630.8795447627. The cubic root of 398009 is about 73.5581781343.

The spelling of 398009 in words is "three hundred ninety-eight thousand, nine".