123399818864 has 40 divisors (see below), whose sum is σ = 273366476640. Its totient is φ = 52861632768.

The previous prime is 123399818863. The next prime is 123399818869. The reversal of 123399818864 is 468818993321.

It is a junction number, because it is equal to n+sod(n) for n = 123399818797 and 123399818806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123399818863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1079 + ... + 496790.

It is an arithmetic number, because the mean of its divisors is an integer number (6834161916).

Almost surely, 2^123399818864 is an apocalyptic number.

123399818864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

123399818864 is an abundant number, since it is smaller than the sum of its proper divisors (149966657776).

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

123399818864 is a wasteful number, since it uses less digits than its factorization.

123399818864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500097 (or 500091 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 62.

The spelling of 123399818864 in words is "one hundred twenty-three billion, three hundred ninety-nine million, eight hundred eighteen thousand, eight hundred sixty-four".