398064857 has 2 divisors, whose sum is σ = 398064858. Its totient is φ = 398064856.

The previous prime is 398064829. The next prime is 398064883. The reversal of 398064857 is 758460893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277855561 + 120209296 = 16669^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 398064857 - 2¹⁶ = 397999321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398064827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199032428 + 199032429.

It is an arithmetic number, because the mean of its divisors is an integer number (199032429).

Almost surely, 2^398064857 is an apocalyptic number.

It is an amenable number.

398064857 is a deficient number, since it is larger than the sum of its proper divisors (1).

398064857 is an equidigital number, since it uses as much as digits as its factorization.

398064857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 398064857 is about 19951.5627708709. The cubic root of 398064857 is about 735.6161905058.

The spelling of 398064857 in words is "three hundred ninety-eight million, sixty-four thousand, eight hundred fifty-seven".