556438 has 4 divisors (see below), whose sum is σ = 834660. Its totient is φ = 278218.

The previous prime is 556403. The next prime is 556441. The reversal of 556438 is 834655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834655 = 5 ⋅166931.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 139108 + ... + 139111.

It is an arithmetic number, because the mean of its divisors is an integer number (208665).

2⁵⁵⁶⁴³⁸ is an apocalyptic number.

556438 is a deficient number, since it is larger than the sum of its proper divisors (278222).

556438 is a wasteful number, since it uses less digits than its factorization.

556438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278221.

The product of its digits is 14400, while the sum is 31.

The square root of 556438 is about 745.9477193477. The cubic root of 556438 is about 82.2505720220.

The spelling of 556438 in words is "five hundred fifty-six thousand, four hundred thirty-eight".