12307640 has 16 divisors (see below), whose sum is σ = 27692280. Its totient is φ = 4923040.

The previous prime is 12307639. The next prime is 12307657. The reversal of 12307640 is 4670321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153806 + ... + 153885.

Almost surely, 2^12307640 is an apocalyptic number.

12307640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12307640 is an abundant number, since it is smaller than the sum of its proper divisors (15384640).

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

12307640 is a wasteful number, since it uses less digits than its factorization.

12307640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307702 (or 307698 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 12307640 is about 3508.2246222270. The cubic root of 12307640 is about 230.8828075680.

Adding to 12307640 its reverse (4670321), we get a palindrome (16977961).

The spelling of 12307640 in words is "twelve million, three hundred seven thousand, six hundred forty".