123138340140 has 48 divisors (see below), whose sum is σ = 356676576480. Its totient is φ = 31704583680.

The previous prime is 123138340123. The next prime is 123138340153. The reversal of 123138340140 is 41043831321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 123138340098 and 123138340107.

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, 35382841 + ... + 35386320.

It is an arithmetic number, because the mean of its divisors is an integer number (7430762010).

Almost surely, 2^123138340140 is an apocalyptic number.

123138340140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123138340140 is an abundant number, since it is smaller than the sum of its proper divisors (233538236340).

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

123138340140 is a wasteful number, since it uses less digits than its factorization.

123138340140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70769202 (or 70769200 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 123138340140 in words is "one hundred twenty-three billion, one hundred thirty-eight million, three hundred forty thousand, one hundred forty".