398103557 has 2 divisors, whose sum is σ = 398103558. Its totient is φ = 398103556.

The previous prime is 398103551. The next prime is 398103571. The reversal of 398103557 is 755301893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385493956 + 12609601 = 19634^2 + 3551^2 .

It is a cyclic number.

It is not a de Polignac number, because 398103557 - 2¹⁸ = 397841413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398103551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199051778 + 199051779.

It is an arithmetic number, because the mean of its divisors is an integer number (199051779).

Almost surely, 2^398103557 is an apocalyptic number.

It is an amenable number.

398103557 is a deficient number, since it is larger than the sum of its proper divisors (1).

398103557 is an equidigital number, since it uses as much as digits as its factorization.

398103557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 398103557 is about 19952.5325961393. The cubic root of 398103557 is about 735.6400286849.

The spelling of 398103557 in words is "three hundred ninety-eight million, one hundred three thousand, five hundred fifty-seven".