12138258 has 32 divisors (see below), whose sum is σ = 26609472. Its totient is φ = 3660800.

The previous prime is 12138251. The next prime is 12138263. The reversal of 12138258 is 85283121.

12138258 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12138251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23038 + ... + 23558.

It is an arithmetic number, because the mean of its divisors is an integer number (831546).

Almost surely, 2^12138258 is an apocalyptic number.

12138258 is an abundant number, since it is smaller than the sum of its proper divisors (14471214).

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

12138258 is a wasteful number, since it uses less digits than its factorization.

12138258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its digits is 3840, while the sum is 30.

The square root of 12138258 is about 3484.0002870264. Note that the first 3 decimals coincide. The cubic root of 12138258 is about 229.8187481911.

The spelling of 12138258 in words is "twelve million, one hundred thirty-eight thousand, two hundred fifty-eight".