123216552 has 96 divisors (see below), whose sum is σ = 348828480. Its totient is φ = 40746240.

The previous prime is 123216547. The next prime is 123216553. The reversal of 123216552 is 255612321.

It is a happy number.

123216552 is a `hidden beast` number, since 1 + 2 + 3 + 2 + 1 + 655 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (123216553) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 468373 + ... + 468635.

It is an arithmetic number, because the mean of its divisors is an integer number (3633630).

Almost surely, 2^123216552 is an apocalyptic number.

123216552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123216552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174414240).

123216552 is an abundant number, since it is smaller than the sum of its proper divisors (225611928).

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

123216552 is a wasteful number, since it uses less digits than its factorization.

123216552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 509 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 123216552 is about 11100.2951312116. The cubic root of 123216552 is about 497.6106697222.

Adding to 123216552 its reverse (255612321), we get a palindrome (378828873).

The spelling of 123216552 in words is "one hundred twenty-three million, two hundred sixteen thousand, five hundred fifty-two".