12138620 has 24 divisors (see below), whose sum is σ = 27452544. Its totient is φ = 4481856.

The previous prime is 12138613. The next prime is 12138631. The reversal of 12138620 is 2683121.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23084 + ... + 23603.

It is an arithmetic number, because the mean of its divisors is an integer number (1143856).

Almost surely, 2^12138620 is an apocalyptic number.

12138620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12138620 is an abundant number, since it is smaller than the sum of its proper divisors (15313924).

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

12138620 is a wasteful number, since it uses less digits than its factorization.

12138620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46709 (or 46707 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12138620 is about 3484.0522384143. The cubic root of 12138620 is about 229.8210328012.

The spelling of 12138620 in words is "twelve million, one hundred thirty-eight thousand, six hundred twenty".