12127640 has 32 divisors (see below), whose sum is σ = 31186080. Its totient is φ = 4157952.

The previous prime is 12127637. The next prime is 12127663. The reversal of 12127640 is 4672121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21377 + ... + 21936.

It is an arithmetic number, because the mean of its divisors is an integer number (974565).

Almost surely, 2^12127640 is an apocalyptic number.

12127640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12127640 is an abundant number, since it is smaller than the sum of its proper divisors (19058440).

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

12127640 is a wasteful number, since it uses less digits than its factorization.

12127640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43331 (or 43327 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 12127640 is about 3482.4761305715. The cubic root of 12127640 is about 229.7517169541.

Adding to 12127640 its reverse (4672121), we get a palindrome (16799761).

The spelling of 12127640 in words is "twelve million, one hundred twenty-seven thousand, six hundred forty".