123809797998 has 32 divisors (see below), whose sum is σ = 291317173920. Its totient is φ = 38842289280.

The previous prime is 123809797963. The next prime is 123809797999. The reversal of 123809797998 is 899797908321.

123809797998 is a `hidden beast` number, since 1 + 2 + 380 + 97 + 9 + 79 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123809797999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67433613 + ... + 67435448.

It is an arithmetic number, because the mean of its divisors is an integer number (9103661685).

Almost surely, 2^123809797998 is an apocalyptic number.

123809797998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123809797998 is an abundant number, since it is smaller than the sum of its proper divisors (167507375922).

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

123809797998 is a wasteful number, since it uses less digits than its factorization.

123809797998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134869089 (or 134869083 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 72.

The spelling of 123809797998 in words is "one hundred twenty-three billion, eight hundred nine million, seven hundred ninety-seven thousand, nine hundred ninety-eight".