12117438 has 28 divisors (see below), whose sum is σ = 27255048. Its totient is φ = 4038660.

The previous prime is 12117437. The next prime is 12117461. The reversal of 12117438 is 83471121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12117433) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2698 + ... + 5613.

Almost surely, 2^12117438 is an apocalyptic number.

12117438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12117438 is an abundant number, since it is smaller than the sum of its proper divisors (15137610).

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

12117438 is an frugal number, since it uses more digits than its factorization.

12117438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331 (or 8316 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 12117438 is about 3481.0110600226. The cubic root of 12117438 is about 229.6872750518.

Adding to 12117438 its reverse (83471121), we get a palindrome (95588559).

It can be divided in two parts, 1211 and 7438, that added together give a square (8649 = 93²).

The spelling of 12117438 in words is "twelve million, one hundred seventeen thousand, four hundred thirty-eight".