123555321 has 32 divisors (see below), whose sum is σ = 189063680. Its totient is φ = 79688448.

The previous prime is 123555239. The next prime is 123555323.

It is a happy number.

123555321 is a `hidden beast` number, since 123 + 5 + 5 + 532 + 1 = 666.

123555321 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 123555321 - 2⁷ = 123555193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

Its product of digits (4500) is a multiple of the sum of its prime factors (750).

It is not an unprimeable number, because it can be changed into a prime (123555323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 336480 + ... + 336846.

It is an arithmetic number, because the mean of its divisors is an integer number (5908240).

Almost surely, 2^123555321 is an apocalyptic number.

It is an amenable number.

123555321 is a deficient number, since it is larger than the sum of its proper divisors (65508359).

123555321 is a wasteful number, since it uses less digits than its factorization.

123555321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 744 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 123555321 is about 11115.5441162365. The cubic root of 123555321 is about 498.0662925249.

The spelling of 123555321 in words is "one hundred twenty-three million, five hundred fifty-five thousand, three hundred twenty-one".