123900990000 has 100 divisors (see below), whose sum is σ = 399969012696. Its totient is φ = 33040256000.

The previous prime is 123900989987. The next prime is 123900990011. The reversal of 123900990000 is 99009321.

It is a tau number, because it is divible by the number of its divisors (100).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2035017 + ... + 2095016.

Almost surely, 2^123900990000 is an apocalyptic number.

123900990000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123900990000 is an abundant number, since it is smaller than the sum of its proper divisors (276068022696).

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

123900990000 is an equidigital number, since it uses as much as digits as its factorization.

123900990000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130064 (or 4130043 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 33.

Adding to 123900990000 its reverse (99009321), we get a palindrome (123999999321).

The spelling of 123900990000 in words is "one hundred twenty-three billion, nine hundred million, nine hundred ninety thousand".