12661240 has 16 divisors (see below), whose sum is σ = 28487880. Its totient is φ = 5064480.

The previous prime is 12661213. The next prime is 12661241. The reversal of 12661240 is 4216621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661241) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 158226 + ... + 158305.

Almost surely, 2^12661240 is an apocalyptic number.

12661240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12661240 is an abundant number, since it is smaller than the sum of its proper divisors (15826640).

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

12661240 is a wasteful number, since it uses less digits than its factorization.

12661240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316542 (or 316538 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12661240 is about 3558.2636214873. The cubic root of 12661240 is about 233.0730612609.

Adding to 12661240 its reverse (4216621), we get a palindrome (16877861).

The spelling of 12661240 in words is "twelve million, six hundred sixty-one thousand, two hundred forty".