12138418 has 12 divisors (see below), whose sum is σ = 18450558. Its totient is φ = 5989280.

The previous prime is 12138409. The next prime is 12138421. The reversal of 12138418 is 81483121.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 558009 = 3403^2 + 747^2 .

It is a congruent 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, 13338 + ... + 14218.

Almost surely, 2^12138418 is an apocalyptic number.

12138418 is a deficient number, since it is larger than the sum of its proper divisors (6312140).

12138418 is an frugal number, since it uses more digits than its factorization.

12138418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 966 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

The square root of 12138418 is about 3484.0232490613. The cubic root of 12138418 is about 229.8197579691.

The spelling of 12138418 in words is "twelve million, one hundred thirty-eight thousand, four hundred eighteen".