123081637940 has 48 divisors (see below), whose sum is σ = 259250063184. Its totient is φ = 49084569600.

The previous prime is 123081637859. The next prime is 123081637981. The reversal of 123081637940 is 49736180321.

It can be written as a sum of positive squares in 8 ways, for example, as 9784770724 + 113296867216 = 98918^2 + 336596^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123081637891 and 123081637900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9808070 + ... + 9820610.

It is an arithmetic number, because the mean of its divisors is an integer number (5401042983).

Almost surely, 2^123081637940 is an apocalyptic number.

123081637940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123081637940 is an abundant number, since it is smaller than the sum of its proper divisors (136168425244).

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

123081637940 is a wasteful number, since it uses less digits than its factorization.

123081637940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13988 (or 13986 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 123081637940 in words is "one hundred twenty-three billion, eighty-one million, six hundred thirty-seven thousand, nine hundred forty".