123143556 has 12 divisors (see below), whose sum is σ = 287334992. Its totient is φ = 41047848.

The previous prime is 123143551. The next prime is 123143557. The reversal of 123143556 is 655341321.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (123143551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5130970 + ... + 5130993.

Almost surely, 2^123143556 is an apocalyptic number.

It is an amenable number.

123143556 is an abundant number, since it is smaller than the sum of its proper divisors (164191436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123143556 is a wasteful number, since it uses less digits than its factorization.

123143556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261970 (or 10261968 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 123143556 is about 11097.0066234098. The cubic root of 123143556 is about 497.5123854058.

Adding to 123143556 its reverse (655341321), we get a palindrome (778484877).

The spelling of 123143556 in words is "one hundred twenty-three million, one hundred forty-three thousand, five hundred fifty-six".