12309640 has 32 divisors (see below), whose sum is σ = 31654080. Its totient is φ = 4220352.

The previous prime is 12309637. The next prime is 12309707. The reversal of 12309640 is 4690321.

12309640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21702 + ... + 22261.

It is an arithmetic number, because the mean of its divisors is an integer number (989190).

Almost surely, 2^12309640 is an apocalyptic number.

12309640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12309640 is an abundant number, since it is smaller than the sum of its proper divisors (19344440).

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

12309640 is a wasteful number, since it uses less digits than its factorization.

12309640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43981 (or 43977 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 12309640 is about 3508.5096551100. The cubic root of 12309640 is about 230.8953130958.

Adding to 12309640 its reverse (4690321), we get a palindrome (16999961).

The spelling of 12309640 in words is "twelve million, three hundred nine thousand, six hundred forty".