123445500 has 192 divisors, whose sum is σ = 392491008. Its totient is φ = 30028800.

The previous prime is 123445493. The next prime is 123445501. The reversal of 123445500 is 5544321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123445501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1198449 + ... + 1198551.

It is an arithmetic number, because the mean of its divisors is an integer number (2044224).

Almost surely, 2^123445500 is an apocalyptic number.

123445500 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 123445500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196245504).

123445500 is an abundant number, since it is smaller than the sum of its proper divisors (269045508).

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

123445500 is a wasteful number, since it uses less digits than its factorization.

123445500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 123445500 is about 11110.6030439396. The cubic root of 123445500 is about 497.9186815820.

Adding to 123445500 its reverse (5544321), we get a palindrome (128989821).

The spelling of 123445500 in words is "one hundred twenty-three million, four hundred forty-five thousand, five hundred".