12640350 has 48 divisors (see below), whose sum is σ = 33198768. Its totient is φ = 3171840.

The previous prime is 12640307. The next prime is 12640351. The reversal of 12640350 is 5304621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72 + ... + 5028.

It is an arithmetic number, because the mean of its divisors is an integer number (691641).

Almost surely, 2^12640350 is an apocalyptic number.

12640350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12640350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16599384).

12640350 is an abundant number, since it is smaller than the sum of its proper divisors (20558418).

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

12640350 is a wasteful number, since it uses less digits than its factorization.

12640350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989 (or 4984 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 12640350 is about 3555.3269891812. The cubic root of 12640350 is about 232.9448069334.

Adding to 12640350 its reverse (5304621), we get a palindrome (17944971).

The spelling of 12640350 in words is "twelve million, six hundred forty thousand, three hundred fifty".