12251538 has 48 divisors (see below), whose sum is σ = 29307096. Its totient is φ = 3674880.

The previous prime is 12251501. The next prime is 12251549. The reversal of 12251538 is 83515221.

It is a happy number.

12251538 is a `hidden beast` number, since 122 + 5 + 1 + 538 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6066369 + 6185169 = 2463^2 + 2487^2 .

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 23 ways as a sum of consecutive naturals, for example, 8956 + ... + 10232.

Almost surely, 2^12251538 is an apocalyptic number.

12251538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12251538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14653548).

12251538 is an abundant number, since it is smaller than the sum of its proper divisors (17055558).

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

12251538 is a wasteful number, since it uses less digits than its factorization.

12251538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1336 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 12251538 is about 3500.2197073898. The cubic root of 12251538 is about 230.5314616156.

Adding to 12251538 its reverse (83515221), we get a palindrome (95766759).

The spelling of 12251538 in words is "twelve million, two hundred fifty-one thousand, five hundred thirty-eight".