12138930 has 32 divisors (see below), whose sum is σ = 32371200. Its totient is φ = 3236976.

The previous prime is 12138869. The next prime is 12138937. The reversal of 12138930 is 3983121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12138894 and 12138903.

It is not an unprimeable number, because it can be changed into a prime (12138937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22210 + ... + 22749.

It is an arithmetic number, because the mean of its divisors is an integer number (1011600).

Almost surely, 2^12138930 is an apocalyptic number.

12138930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12138930 is an abundant number, since it is smaller than the sum of its proper divisors (20232270).

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

12138930 is a wasteful number, since it uses less digits than its factorization.

12138930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44975 (or 44969 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12138930 is about 3484.0967265563. The cubic root of 12138930 is about 229.8229891991.

The spelling of 12138930 in words is "twelve million, one hundred thirty-eight thousand, nine hundred thirty".