399126229 has 2 divisors, whose sum is σ = 399126230. Its totient is φ = 399126228.

The previous prime is 399126227. The next prime is 399126239. The reversal of 399126229 is 922621993.

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., 201583204 + 197543025 = 14198^2 + 14055^2 .

It is a cyclic number.

It is not a de Polignac number, because 399126229 - 2¹ = 399126227 is a prime.

Together with 399126227, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399126227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199563114 + 199563115.

It is an arithmetic number, because the mean of its divisors is an integer number (199563115).

Almost surely, 2^399126229 is an apocalyptic number.

It is an amenable number.

399126229 is a deficient number, since it is larger than the sum of its proper divisors (1).

399126229 is an equidigital number, since it uses as much as digits as its factorization.

399126229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 43.

The square root of 399126229 is about 19978.1437826441. The cubic root of 399126229 is about 736.2694086238.

The spelling of 399126229 in words is "three hundred ninety-nine million, one hundred twenty-six thousand, two hundred twenty-nine".