398000129 has 2 divisors, whose sum is σ = 398000130. Its totient is φ = 398000128.

The previous prime is 398000117. The next prime is 398000143. The reversal of 398000129 is 921000893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301960129 + 96040000 = 17377^2 + 9800^2 .

It is a cyclic number.

It is not a de Polignac number, because 398000129 - 2¹² = 397996033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 398000095 and 398000104.

It is not a weakly prime, because it can be changed into another prime (398000179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199000064 + 199000065.

It is an arithmetic number, because the mean of its divisors is an integer number (199000065).

It is a Proth number, since it is equal to 6073 ⋅ 2¹⁶ + 1 and 6073 < 2¹⁶.

Almost surely, 2^398000129 is an apocalyptic number.

It is an amenable number.

398000129 is a deficient number, since it is larger than the sum of its proper divisors (1).

398000129 is an equidigital number, since it uses as much as digits as its factorization.

398000129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 398000129 is about 19949.9405763526. The cubic root of 398000129 is about 735.5763163119.

The spelling of 398000129 in words is "three hundred ninety-eight million, one hundred twenty-nine", and thus it is an aban number.