123128300 has 18 divisors (see below), whose sum is σ = 267188628. Its totient is φ = 49251280.

The previous prime is 123128293. The next prime is 123128329. The reversal of 123128300 is 3821321.

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 5 ways as a sum of consecutive naturals, for example, 615542 + ... + 615741.

Almost surely, 2^123128300 is an apocalyptic number.

123128300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123128300 is an abundant number, since it is smaller than the sum of its proper divisors (144060328).

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

123128300 is a wasteful number, since it uses less digits than its factorization.

123128300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231297 (or 1231290 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 123128300 is about 11096.3192095397. The cubic root of 123128300 is about 497.4918392978.

Adding to 123128300 its reverse (3821321), we get a palindrome (126949621).

The spelling of 123128300 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, three hundred".