123134940 has 72 divisors (see below), whose sum is σ = 378666288. Its totient is φ = 32382720.

The previous prime is 123134933. The next prime is 123134969. The reversal of 123134940 is 49431321.

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 23 ways as a sum of consecutive naturals, for example, 8455 + ... + 17825.

It is an arithmetic number, because the mean of its divisors is an integer number (5259254).

Almost surely, 2^123134940 is an apocalyptic number.

123134940 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 123134940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189333144).

123134940 is an abundant number, since it is smaller than the sum of its proper divisors (255531348).

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

123134940 is a wasteful number, since it uses less digits than its factorization.

123134940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459 (or 9454 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 123134940 is about 11096.6184038201. The cubic root of 123134940 is about 497.5007819656.

The spelling of 123134940 in words is "one hundred twenty-three million, one hundred thirty-four thousand, nine hundred forty".