123321320 has 64 divisors (see below), whose sum is σ = 284135040. Its totient is φ = 48160000.

The previous prime is 123321313. The next prime is 123321329. The reversal of 123321320 is 23123321.

It is not an unprimeable number, because it can be changed into a prime (123321329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491195 + ... + 491445.

It is an arithmetic number, because the mean of its divisors is an integer number (4439610).

Almost surely, 2^123321320 is an apocalyptic number.

123321320 is a gapful number since it is divisible by the number (10) 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 123321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142067520).

123321320 is an abundant number, since it is smaller than the sum of its proper divisors (160813720).

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

123321320 is a wasteful number, since it uses less digits than its factorization.

123321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 123321320 is about 11105.0132822973. The cubic root of 123321320 is about 497.7516651345.

Adding to 123321320 its reverse (23123321), we get a palindrome (146444641).

The spelling of 123321320 in words is "one hundred twenty-three million, three hundred twenty-one thousand, three hundred twenty".