398406 has 16 divisors (see below), whose sum is σ = 831744. Its totient is φ = 126984.

The previous prime is 398393. The next prime is 398407. The reversal of 398406 is 604893.

398406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 398406.

It is not an unprimeable number, because it can be changed into a prime (398407) by changing a digit.

398406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1306 + ... + 1581.

It is an arithmetic number, because the mean of its divisors is an integer number (51984).

2³⁹⁸⁴⁰⁶ is an apocalyptic number.

398406 is an abundant number, since it is smaller than the sum of its proper divisors (433338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398406 is a wasteful number, since it uses less digits than its factorization.

398406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 398406 is about 631.1941064364. The cubic root of 398406 is about 73.5826272402.

The spelling of 398406 in words is "three hundred ninety-eight thousand, four hundred six".