398569 has 2 divisors, whose sum is σ = 398570. Its totient is φ = 398568.

The previous prime is 398557. The next prime is 398581. The reversal of 398569 is 965893.

It is a balanced prime because it is at equal distance from previous prime (398557) and next prime (398581).

It can be written as a sum of positive squares in only one way, i.e., 374544 + 24025 = 612^2 + 155^2 .

It is an emirp because it is prime and its reverse (965893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398569 - 2⁷ = 398441 is a prime.

It is a super-2 number, since 2×398569² = 317714495522, which contains 22 as substring.

It is a Chen prime.

It is a nialpdrome in base 9.

It is not a weakly prime, because it can be changed into another prime (398509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199284 + 199285.

It is an arithmetic number, because the mean of its divisors is an integer number (199285).

2³⁹⁸⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

398569 is a deficient number, since it is larger than the sum of its proper divisors (1).

398569 is an equidigital number, since it uses as much as digits as its factorization.

398569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 398569 is about 631.3232135761. The cubic root of 398569 is about 73.5926608348.

The spelling of 398569 in words is "three hundred ninety-eight thousand, five hundred sixty-nine".