398995123 has 2 divisors, whose sum is σ = 398995124. Its totient is φ = 398995122.

The previous prime is 398995081. The next prime is 398995139. The reversal of 398995123 is 321599893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 398995123 - 2¹⁷ = 398864051 is a prime.

It is not a weakly prime, because it can be changed into another prime (398995523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199497561 + 199497562.

It is an arithmetic number, because the mean of its divisors is an integer number (199497562).

Almost surely, 2^398995123 is an apocalyptic number.

398995123 is a deficient number, since it is larger than the sum of its proper divisors (1).

398995123 is an equidigital number, since it uses as much as digits as its factorization.

398995123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 398995123 is about 19974.8622773725. The cubic root of 398995123 is about 736.1887825783.

The spelling of 398995123 in words is "three hundred ninety-eight million, nine hundred ninety-five thousand, one hundred twenty-three".