123506530 has 32 divisors (see below), whose sum is σ = 269018496. Its totient is φ = 39853824.

The previous prime is 123506507. The next prime is 123506533. The reversal of 123506530 is 35605321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 123506495 and 123506504.

It is not an unprimeable number, because it can be changed into a prime (123506533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50704 + ... + 53083.

It is an arithmetic number, because the mean of its divisors is an integer number (8406828).

Almost surely, 2^123506530 is an apocalyptic number.

123506530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123506530 is an abundant number, since it is smaller than the sum of its proper divisors (145511966).

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

123506530 is a wasteful number, since it uses less digits than its factorization.

123506530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103818.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 123506530 is about 11113.3491801527. The cubic root of 123506530 is about 498.0007231056. Note that the first 3 decimals are identical.

The spelling of 123506530 in words is "one hundred twenty-three million, five hundred six thousand, five hundred thirty".