398869241 has 2 divisors, whose sum is σ = 398869242. Its totient is φ = 398869240.

The previous prime is 398869231. The next prime is 398869309. The reversal of 398869241 is 142968893.

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., 396607225 + 2262016 = 19915^2 + 1504^2 .

It is an emirp because it is prime and its reverse (142968893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 398869241 - 2²² = 394674937 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 398869241.

It is not a weakly prime, because it can be changed into another prime (398869201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199434620 + 199434621.

It is an arithmetic number, because the mean of its divisors is an integer number (199434621).

Almost surely, 2^398869241 is an apocalyptic number.

It is an amenable number.

398869241 is a deficient number, since it is larger than the sum of its proper divisors (1).

398869241 is an equidigital number, since it uses as much as digits as its factorization.

398869241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 398869241 is about 19971.7110183379. The cubic root of 398869241 is about 736.1113525057. Note that the first 3 decimals are identical.

The spelling of 398869241 in words is "three hundred ninety-eight million, eight hundred sixty-nine thousand, two hundred forty-one".