398120971 has 2 divisors, whose sum is σ = 398120972. Its totient is φ = 398120970.

The previous prime is 398120969. The next prime is 398121023. The reversal of 398120971 is 179021893.

It is a weak prime.

It is an emirp because it is prime and its reverse (179021893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398120971 - 2¹ = 398120969 is a prime.

Together with 398120969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398120071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199060485 + 199060486.

It is an arithmetic number, because the mean of its divisors is an integer number (199060486).

Almost surely, 2^398120971 is an apocalyptic number.

398120971 is a deficient number, since it is larger than the sum of its proper divisors (1).

398120971 is an equidigital number, since it uses as much as digits as its factorization.

398120971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 398120971 is about 19952.9689770721. The cubic root of 398120971 is about 735.6507547455.

The spelling of 398120971 in words is "three hundred ninety-eight million, one hundred twenty thousand, nine hundred seventy-one".