556642 has 4 divisors (see below), whose sum is σ = 834966. Its totient is φ = 278320.

The previous prime is 556639. The next prime is 556651. The reversal of 556642 is 246655.

556642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246655 = 5 ⋅49331.

It can be written as a sum of positive squares in only one way, i.e., 370881 + 185761 = 609^2 + 431^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 556642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139159 + ... + 139162.

2⁵⁵⁶⁶⁴² is an apocalyptic number.

556642 is a deficient number, since it is larger than the sum of its proper divisors (278324).

556642 is a wasteful number, since it uses less digits than its factorization.

556642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278323.

The product of its digits is 7200, while the sum is 28.

The square root of 556642 is about 746.0844456226. The cubic root of 556642 is about 82.2606222981.

The spelling of 556642 in words is "five hundred fifty-six thousand, six hundred forty-two".