12138750 has 120 divisors (see below), whose sum is σ = 35819784. Its totient is φ = 2952000.

The previous prime is 12138743. The next prime is 12138761. The reversal of 12138750 is 5783121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 146209 + ... + 146291.

Almost surely, 2^12138750 is an apocalyptic number.

12138750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12138750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17909892).

12138750 is an abundant number, since it is smaller than the sum of its proper divisors (23681034).

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

12138750 is a wasteful number, since it uses less digits than its factorization.

12138750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 12138750 is about 3484.0708948011. The cubic root of 12138750 is about 229.8218532302.

The spelling of 12138750 in words is "twelve million, one hundred thirty-eight thousand, seven hundred fifty".