123243100 has 18 divisors (see below), whose sum is σ = 267437744. Its totient is φ = 49297200.

The previous prime is 123243091. The next prime is 123243103. The reversal of 123243100 is 1342321.

It is a happy number.

It is a super-2 number, since 2×123243100² = 30377723395220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243103) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 616116 + ... + 616315.

Almost surely, 2^123243100 is an apocalyptic number.

123243100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123243100 is an abundant number, since it is smaller than the sum of its proper divisors (144194644).

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

123243100 is a wasteful number, since it uses less digits than its factorization.

123243100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232445 (or 1232438 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123243100 is about 11101.4908908669. The cubic root of 123243100 is about 497.6464052334.

Adding to 123243100 its reverse (1342321), we get a palindrome (124585421).

The spelling of 123243100 in words is "one hundred twenty-three million, two hundred forty-three thousand, one hundred".