123556 has 24 divisors (see below), whose sum is σ = 241920. Its totient is φ = 54912.

The previous prime is 123553. The next prime is 123581. The reversal of 123556 is 655321.

123556 = T₂₃ + T₂₄ + ... + T₉₀.

It is a happy number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (10080).

2¹²³⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

123556 is a deficient number, since it is larger than the sum of its proper divisors (118364).

123556 is a wasteful number, since it uses less digits than its factorization.

123556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 121 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 123556 is about 351.5053342412. The cubic root of 123556 is about 49.8067204900.

Adding to 123556 its reverse (655321), we get a palindrome (778877).

The spelling of 123556 in words is "one hundred twenty-three thousand, five hundred fifty-six".