398240797 has 2 divisors, whose sum is σ = 398240798. Its totient is φ = 398240796.

The previous prime is 398240783. The next prime is 398240803. The reversal of 398240797 is 797042893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369446841 + 28793956 = 19221^2 + 5366^2 .

It is a cyclic number.

It is not a de Polignac number, because 398240797 - 2¹⁵ = 398208029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398240797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398240747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199120398 + 199120399.

It is an arithmetic number, because the mean of its divisors is an integer number (199120399).

Almost surely, 2^398240797 is an apocalyptic number.

It is an amenable number.

398240797 is a deficient number, since it is larger than the sum of its proper divisors (1).

398240797 is an equidigital number, since it uses as much as digits as its factorization.

398240797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 49.

The square root of 398240797 is about 19955.9714621965. The cubic root of 398240797 is about 735.7245524531.

The spelling of 398240797 in words is "three hundred ninety-eight million, two hundred forty thousand, seven hundred ninety-seven".