12138650 has 12 divisors (see below), whose sum is σ = 22577982. Its totient is φ = 4855440.

The previous prime is 12138649. The next prime is 12138661. The reversal of 12138650 is 5683121.

12138650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 10067929 + 2070721 = 3173^2 + 1439^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121337 + ... + 121436.

Almost surely, 2^12138650 is an apocalyptic number.

12138650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12138650 is a deficient number, since it is larger than the sum of its proper divisors (10439332).

12138650 is a wasteful number, since it uses less digits than its factorization.

12138650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242785 (or 242780 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 12138650 is about 3484.0565437432. The cubic root of 12138650 is about 229.8212221314.

The spelling of 12138650 in words is "twelve million, one hundred thirty-eight thousand, six hundred fifty".