556538 has 4 divisors (see below), whose sum is σ = 834810. Its totient is φ = 278268.

The previous prime is 556537. The next prime is 556559. The reversal of 556538 is 835655.

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

It can be written as a sum of positive squares in only one way, i.e., 552049 + 4489 = 743^2 + 67^2 .

It is a super-3 number, since 3×556538³ = 517137133356938616, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (556537) 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, 139133 + ... + 139136.

2⁵⁵⁶⁵³⁸ is an apocalyptic number.

556538 is a deficient number, since it is larger than the sum of its proper divisors (278272).

556538 is a wasteful number, since it uses less digits than its factorization.

556538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278271.

The product of its digits is 18000, while the sum is 32.

The square root of 556538 is about 746.0147451626. The cubic root of 556538 is about 82.2554989348.

The spelling of 556538 in words is "five hundred fifty-six thousand, five hundred thirty-eight".