398557 has 2 divisors, whose sum is σ = 398558. Its totient is φ = 398556.

The previous prime is 398549. The next prime is 398569. The reversal of 398557 is 755893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395641 + 2916 = 629^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 398557 - 2³ = 398549 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 9² + 5⁴ + 8⁴ + 5⁸ + 7⁴ .

It is a nialpdrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199278 + 199279.

It is an arithmetic number, because the mean of its divisors is an integer number (199279).

2³⁹⁸⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

398557 is a deficient number, since it is larger than the sum of its proper divisors (1).

398557 is an equidigital number, since it uses as much as digits as its factorization.

398557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 398557 is about 631.3137096563. The cubic root of 398557 is about 73.5919222586.

The spelling of 398557 in words is "three hundred ninety-eight thousand, five hundred fifty-seven".