123617989900 has 36 divisors (see below), whose sum is σ = 268412126080. Its totient is φ = 49417502400.

The previous prime is 123617989897. The next prime is 123617989907. The reversal of 123617989900 is 9989716321.

It is not an unprimeable number, because it can be changed into a prime (123617989907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203436 + ... + 537235.

Almost surely, 2^123617989900 is an apocalyptic number.

123617989900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123617989900 is an abundant number, since it is smaller than the sum of its proper divisors (144794136180).

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

123617989900 is a wasteful number, since it uses less digits than its factorization.

123617989900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742354 (or 742347 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 123617989900 in words is "one hundred twenty-three billion, six hundred seventeen million, nine hundred eighty-nine thousand, nine hundred".