123329781900 has 360 divisors, whose sum is σ = 445396440720. Its totient is φ = 29310543360.

The previous prime is 123329781877. The next prime is 123329781917. The reversal of 123329781900 is 9187923321.

It is a super-2 number, since 2×123329781900² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3033507 + ... + 3073893.

Almost surely, 2^123329781900 is an apocalyptic number.

123329781900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123329781900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222698220360).

123329781900 is an abundant number, since it is smaller than the sum of its proper divisors (322066658820).

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

123329781900 is a wasteful number, since it uses less digits than its factorization.

123329781900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40455 (or 40439 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 123329781900 in words is "one hundred twenty-three billion, three hundred twenty-nine million, seven hundred eighty-one thousand, nine hundred".