12351640 has 64 divisors (see below), whose sum is σ = 32808960. Its totient is φ = 4095360.

The previous prime is 12351631. The next prime is 12351643. The reversal of 12351640 is 4615321.

12351640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12351643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7969 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (512640).

Almost surely, 2^12351640 is an apocalyptic number.

12351640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12351640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16404480).

12351640 is an abundant number, since it is smaller than the sum of its proper divisors (20457320).

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

12351640 is a wasteful number, since it uses less digits than its factorization.

12351640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1468 counting only the distinct ones).

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

The square root of 12351640 is about 3514.4900056765. The cubic root of 12351640 is about 231.1576168602.

Adding to 12351640 its reverse (4615321), we get a palindrome (16966961).

The spelling of 12351640 in words is "twelve million, three hundred fifty-one thousand, six hundred forty".