398005123 has 2 divisors, whose sum is σ = 398005124. Its totient is φ = 398005122.

The previous prime is 398005121. The next prime is 398005129. The reversal of 398005123 is 321500893.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398005123 - 2¹ = 398005121 is a prime.

Together with 398005121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398005121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199002561 + 199002562.

It is an arithmetic number, because the mean of its divisors is an integer number (199002562).

Almost surely, 2^398005123 is an apocalyptic number.

398005123 is a deficient number, since it is larger than the sum of its proper divisors (1).

398005123 is an equidigital number, since it uses as much as digits as its factorization.

398005123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 398005123 is about 19950.0657392401. The cubic root of 398005123 is about 735.5793929045.

The spelling of 398005123 in words is "three hundred ninety-eight million, five thousand, one hundred twenty-three".