399241 has 2 divisors, whose sum is σ = 399242. Its totient is φ = 399240.

The previous prime is 399239. The next prime is 399263. The reversal of 399241 is 142993.

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., 395641 + 3600 = 629^2 + 60^2 .

It is an emirp because it is prime and its reverse (142993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399241 - 2¹ = 399239 is a prime.

Together with 399239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (399221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199620 + 199621.

It is an arithmetic number, because the mean of its divisors is an integer number (199621).

2³⁹⁹²⁴¹ is an apocalyptic number.

It is an amenable number.

399241 is a deficient number, since it is larger than the sum of its proper divisors (1).

399241 is an equidigital number, since it uses as much as digits as its factorization.

399241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 399241 is about 631.8552049323. The cubic root of 399241 is about 73.6339974668.

The spelling of 399241 in words is "three hundred ninety-nine thousand, two hundred forty-one".