399555223 has 2 divisors, whose sum is σ = 399555224. Its totient is φ = 399555222.

The previous prime is 399555173. The next prime is 399555229. The reversal of 399555223 is 322555993.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (322555993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399555223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399555223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399555229) 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, 199777611 + 199777612.

It is an arithmetic number, because the mean of its divisors is an integer number (199777612).

Almost surely, 2^399555223 is an apocalyptic number.

399555223 is a deficient number, since it is larger than the sum of its proper divisors (1).

399555223 is an equidigital number, since it uses as much as digits as its factorization.

399555223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 364500, while the sum is 43.

The square root of 399555223 is about 19988.8774822400. The cubic root of 399555223 is about 736.5331030304.

The spelling of 399555223 in words is "three hundred ninety-nine million, five hundred fifty-five thousand, two hundred twenty-three".