398549 has 2 divisors, whose sum is σ = 398550. Its totient is φ = 398548.

The previous prime is 398543. The next prime is 398557. The reversal of 398549 is 945893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 117649 = 530^2 + 343^2 .

It is a cyclic number.

It is not a de Polignac number, because 398549 - 2¹² = 394453 is a prime.

It is a Chen prime.

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 (398543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199274 + 199275.

It is an arithmetic number, because the mean of its divisors is an integer number (199275).

2³⁹⁸⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

398549 is a deficient number, since it is larger than the sum of its proper divisors (1).

398549 is an equidigital number, since it uses as much as digits as its factorization.

398549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 398549 is about 631.3073736303. The cubic root of 398549 is about 73.5914298662.

The spelling of 398549 in words is "three hundred ninety-eight thousand, five hundred forty-nine".