123731761940 has 24 divisors (see below), whose sum is σ = 264096320712. Its totient is φ = 48681348480.

The previous prime is 123731761921. The next prime is 123731762003. The reversal of 123731761940 is 49167137321.

It can be written as a sum of positive squares in 4 ways, for example, as 7258358416 + 116473403524 = 85196^2 + 341282^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123731761891 and 123731761900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50708519 + ... + 50710958.

It is an arithmetic number, because the mean of its divisors is an integer number (11004013363).

Almost surely, 2^123731761940 is an apocalyptic number.

123731761940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123731761940 is an abundant number, since it is smaller than the sum of its proper divisors (140364558772).

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

123731761940 is a wasteful number, since it uses less digits than its factorization.

123731761940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101419547 (or 101419545 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 123731761940 in words is "one hundred twenty-three billion, seven hundred thirty-one million, seven hundred sixty-one thousand, nine hundred forty".