123156340 has 24 divisors (see below), whose sum is σ = 258924960. Its totient is φ = 49206048.

The previous prime is 123156337. The next prime is 123156361. The reversal of 123156340 is 43651321.

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 7 ways as a sum of consecutive naturals, for example, 17359 + ... + 23401.

It is an arithmetic number, because the mean of its divisors is an integer number (10788540).

Almost surely, 2^123156340 is an apocalyptic number.

123156340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123156340 is an abundant number, since it is smaller than the sum of its proper divisors (135768620).

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

123156340 is a wasteful number, since it uses less digits than its factorization.

123156340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071 (or 7069 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 123156340 is about 11097.5826196519. The cubic root of 123156340 is about 497.5296010265.

The spelling of 123156340 in words is "one hundred twenty-three million, one hundred fifty-six thousand, three hundred forty".