556399 has 2 divisors, whose sum is σ = 556400. Its totient is φ = 556398.

The previous prime is 556373. The next prime is 556403. The reversal of 556399 is 993655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556399 - 2⁷ = 556271 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 5³ + 5⁵ + 3⁹ + 6⁴ + 9³ + 9⁶ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556799) 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, 278199 + 278200.

It is an arithmetic number, because the mean of its divisors is an integer number (278200).

2⁵⁵⁶³⁹⁹ is an apocalyptic number.

556399 is a deficient number, since it is larger than the sum of its proper divisors (1).

556399 is an equidigital number, since it uses as much as digits as its factorization.

556399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 37.

The square root of 556399 is about 745.9215776474. The cubic root of 556399 is about 82.2486503660.

The spelling of 556399 in words is "five hundred fifty-six thousand, three hundred ninety-nine".