12640374 has 48 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 4072680.

The previous prime is 12640373. The next prime is 12640393. The reversal of 12640374 is 47304621.

12640374 is a `hidden beast` number, since 12 + 640 + 3 + 7 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640373) 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, 14647 + ... + 15485.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^12640374 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12640374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14676480).

12640374 is an abundant number, since it is smaller than the sum of its proper divisors (16712586).

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

12640374 is an equidigital number, since it uses as much as digits as its factorization.

12640374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 12640374 is about 3555.3303643965. The cubic root of 12640374 is about 232.9449543626.

Adding to 12640374 its reverse (47304621), we get a palindrome (59944995).

The spelling of 12640374 in words is "twelve million, six hundred forty thousand, three hundred seventy-four".