398305073 has 2 divisors, whose sum is σ = 398305074. Its totient is φ = 398305072.

The previous prime is 398305057. The next prime is 398305109. The reversal of 398305073 is 370503893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383689744 + 14615329 = 19588^2 + 3823^2 .

It is a cyclic number.

It is not a de Polignac number, because 398305073 - 2⁴ = 398305057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (398305043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199152536 + 199152537.

It is an arithmetic number, because the mean of its divisors is an integer number (199152537).

Almost surely, 2^398305073 is an apocalyptic number.

It is an amenable number.

398305073 is a deficient number, since it is larger than the sum of its proper divisors (1).

398305073 is an equidigital number, since it uses as much as digits as its factorization.

398305073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 398305073 is about 19957.5818424979. The cubic root of 398305073 is about 735.7641322649.

The spelling of 398305073 in words is "three hundred ninety-eight million, three hundred five thousand, seventy-three".