398566 has 20 divisors (see below), whose sum is σ = 705852. Its totient is φ = 168756.

The previous prime is 398557. The next prime is 398569. The reversal of 398566 is 665893.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398569) by changing a digit.

398566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4761 + ... + 4843.

2³⁹⁸⁵⁶⁶ is an apocalyptic number.

398566 is a deficient number, since it is larger than the sum of its proper divisors (307286).

398566 is an frugal number, since it uses more digits than its factorization.

398566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 92 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 398566 is about 631.3208376095. The cubic root of 398566 is about 73.5924761921.

The spelling of 398566 in words is "three hundred ninety-eight thousand, five hundred sixty-six".