556278389 has 4 divisors (see below), whose sum is σ = 557146860. Its totient is φ = 555409920.

The previous prime is 556278379. The next prime is 556278449. The reversal of 556278389 is 983872655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 363207364 + 193071025 = 19058^2 + 13895^2 .

It is a cyclic number.

It is not a de Polignac number, because 556278389 - 2¹² = 556274293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 556278389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556278379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433274 + ... + 434555.

It is an arithmetic number, because the mean of its divisors is an integer number (139286715).

Almost surely, 2^556278389 is an apocalyptic number.

It is an amenable number.

556278389 is a deficient number, since it is larger than the sum of its proper divisors (868471).

556278389 is an equidigital number, since it uses as much as digits as its factorization.

556278389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868470.

The product of its digits is 3628800, while the sum is 53.

The square root of 556278389 is about 23585.5546680590. The cubic root of 556278389 is about 822.4270690408.

The spelling of 556278389 in words is "five hundred fifty-six million, two hundred seventy-eight thousand, three hundred eighty-nine".