12138655 has 4 divisors (see below), whose sum is σ = 14566392. Its totient is φ = 9710920.

The previous prime is 12138649. The next prime is 12138661. The reversal of 12138655 is 55683121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12138649) and next prime (12138661).

It is not a de Polignac number, because 12138655 - 2³ = 12138647 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213861 + ... + 1213870.

It is an arithmetic number, because the mean of its divisors is an integer number (3641598).

Almost surely, 2^12138655 is an apocalyptic number.

12138655 is a deficient number, since it is larger than the sum of its proper divisors (2427737).

12138655 is an equidigital number, since it uses as much as digits as its factorization.

12138655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427736.

The product of its digits is 7200, while the sum is 31.

The square root of 12138655 is about 3484.0572612975. The cubic root of 12138655 is about 229.8212536865.

The spelling of 12138655 in words is "twelve million, one hundred thirty-eight thousand, six hundred fifty-five".