120556 has 6 divisors (see below), whose sum is σ = 210980. Its totient is φ = 60276.

The previous prime is 120551. The next prime is 120557. The reversal of 120556 is 655021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (120551) by changing a digit.

120556 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 15066 + ... + 15073.

2¹²⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

120556 is a deficient number, since it is larger than the sum of its proper divisors (90424).

120556 is a wasteful number, since it uses less digits than its factorization.

120556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30143 (or 30141 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 120556 is about 347.2117509532. The cubic root of 120556 is about 49.4003026857.

Adding to 120556 its reverse (655021), we get a palindrome (775577).

It can be divided in two parts, 120 and 556, that added together give a palindrome (676).

The spelling of 120556 in words is "one hundred twenty thousand, five hundred fifty-six".