12315640 has 16 divisors (see below), whose sum is σ = 27710280. Its totient is φ = 4926240.

The previous prime is 12315631. The next prime is 12315643. The reversal of 12315640 is 4651321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153906 + ... + 153985.

Almost surely, 2^12315640 is an apocalyptic number.

12315640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12315640 is an abundant number, since it is smaller than the sum of its proper divisors (15394640).

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

12315640 is a wasteful number, since it uses less digits than its factorization.

12315640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307902 (or 307898 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12315640 is about 3509.3646148555. The cubic root of 12315640 is about 230.9328215540.

Adding to 12315640 its reverse (4651321), we get a palindrome (16966961).

The spelling of 12315640 in words is "twelve million, three hundred fifteen thousand, six hundred forty".