12640390 has 32 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 4313184.

The previous prime is 12640373. The next prime is 12640393. The reversal of 12640390 is 9304621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640393) 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, 24879 + ... + 25381.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^12640390 is an apocalyptic number.

12640390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12640390 is an abundant number, since it is smaller than the sum of its proper divisors (13486970).

12640390 is a wasteful number, since it uses less digits than its factorization.

12640390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

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

The square root of 12640390 is about 3555.3326145383. The cubic root of 12640390 is about 232.9450526487.

The spelling of 12640390 in words is "twelve million, six hundred forty thousand, three hundred ninety".