123455500 has 72 divisors (see below), whose sum is σ = 313709760. Its totient is φ = 42319200.

The previous prime is 123455461. The next prime is 123455531. The reversal of 123455500 is 5554321.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21981 + ... + 27019.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^123455500 is an apocalyptic number.

123455500 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 123455500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156854880).

123455500 is an abundant number, since it is smaller than the sum of its proper divisors (190254260).

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

123455500 is a wasteful number, since it uses less digits than its factorization.

123455500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5072 (or 5053 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 123455500 is about 11111.0530554039. The cubic root of 123455500 is about 497.9321262529.

The spelling of 123455500 in words is "one hundred twenty-three million, four hundred fifty-five thousand, five hundred".