123829731920 has 30 divisors (see below), whose sum is σ = 287911444698. Its totient is φ = 49530633792.

The previous prime is 123829731913. The next prime is 123829731931. The reversal of 123829731920 is 29137928321.

It can be written as a sum of positive squares in only one way, i.e., 99063785536 + 24765946384 = 314744^2 + 157372^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3127769 + ... + 3167111.

Almost surely, 2^123829731920 is an apocalyptic number.

123829731920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123829731920 is an abundant number, since it is smaller than the sum of its proper divisors (164081712778).

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

123829731920 is an frugal number, since it uses more digits than its factorization.

123829731920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78699 (or 39350 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 123829731920 in words is "one hundred twenty-three billion, eight hundred twenty-nine million, seven hundred thirty-one thousand, nine hundred twenty".