123135500 has 24 divisors (see below), whose sum is σ = 268929024. Its totient is φ = 49254000.

The previous prime is 123135499. The next prime is 123135521. The reversal of 123135500 is 5531321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122636 + ... + 123635.

It is an arithmetic number, because the mean of its divisors is an integer number (11205376).

Almost surely, 2^123135500 is an apocalyptic number.

123135500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123135500 is an abundant number, since it is smaller than the sum of its proper divisors (145793524).

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

123135500 is a wasteful number, since it uses less digits than its factorization.

123135500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246290 (or 246278 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 123135500 is about 11096.6436367038. The cubic root of 123135500 is about 497.5015361518.

Adding to 123135500 its reverse (5531321), we get a palindrome (128666821).

The spelling of 123135500 in words is "one hundred twenty-three million, one hundred thirty-five thousand, five hundred".