398740229 has 2 divisors, whose sum is σ = 398740230. Its totient is φ = 398740228.

The previous prime is 398740201. The next prime is 398740283. The reversal of 398740229 is 922047893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296184100 + 102556129 = 17210^2 + 10127^2 .

It is a cyclic number.

It is not a de Polignac number, because 398740229 - 2¹² = 398736133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 398740229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398740429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199370114 + 199370115.

It is an arithmetic number, because the mean of its divisors is an integer number (199370115).

Almost surely, 2^398740229 is an apocalyptic number.

It is an amenable number.

398740229 is a deficient number, since it is larger than the sum of its proper divisors (1).

398740229 is an equidigital number, since it uses as much as digits as its factorization.

398740229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 398740229 is about 19968.4808886405. The cubic root of 398740229 is about 736.0319802631.

The spelling of 398740229 in words is "three hundred ninety-eight million, seven hundred forty thousand, two hundred twenty-nine".