398501797 has 2 divisors, whose sum is σ = 398501798. Its totient is φ = 398501796.

The previous prime is 398501791. The next prime is 398501813. The reversal of 398501797 is 797105893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213568996 + 184932801 = 14614^2 + 13599^2 .

It is a cyclic number.

It is not a de Polignac number, because 398501797 - 2¹⁹ = 397977509 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398501797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398501791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199250898 + 199250899.

It is an arithmetic number, because the mean of its divisors is an integer number (199250899).

Almost surely, 2^398501797 is an apocalyptic number.

It is an amenable number.

398501797 is a deficient number, since it is larger than the sum of its proper divisors (1).

398501797 is an equidigital number, since it uses as much as digits as its factorization.

398501797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 49.

The square root of 398501797 is about 19962.5097870984. The cubic root of 398501797 is about 735.8852443219.

The spelling of 398501797 in words is "three hundred ninety-eight million, five hundred one thousand, seven hundred ninety-seven".