398635849 has 2 divisors, whose sum is σ = 398635850. Its totient is φ = 398635848.

The previous prime is 398635841. The next prime is 398635859. The reversal of 398635849 is 948536893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362635849 + 36000000 = 19043^2 + 6000^2 .

It is a cyclic number.

It is not a de Polignac number, because 398635849 - 2³ = 398635841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398635849.

It is not a weakly prime, because it can be changed into another prime (398635841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199317924 + 199317925.

It is an arithmetic number, because the mean of its divisors is an integer number (199317925).

Almost surely, 2^398635849 is an apocalyptic number.

It is an amenable number.

398635849 is a deficient number, since it is larger than the sum of its proper divisors (1).

398635849 is an equidigital number, since it uses as much as digits as its factorization.

398635849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The square root of 398635849 is about 19965.8670986261. The cubic root of 398635849 is about 735.9677498717.

The spelling of 398635849 in words is "three hundred ninety-eight million, six hundred thirty-five thousand, eight hundred forty-nine".