12640380 has 48 divisors (see below), whose sum is σ = 35610624. Its totient is φ = 3350080.

The previous prime is 12640373. The next prime is 12640393. The reversal of 12640380 is 8304621.

It is a happy number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12640380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10909 + ... + 12011.

It is an arithmetic number, because the mean of its divisors is an integer number (741888).

Almost surely, 2^12640380 is an apocalyptic number.

12640380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640380 is an abundant number, since it is smaller than the sum of its proper divisors (22970244).

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

12640380 is a wasteful number, since it uses less digits than its factorization.

12640380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 12640380 is about 3555.3312081999. The cubic root of 12640380 is about 232.9449912199.

The spelling of 12640380 in words is "twelve million, six hundred forty thousand, three hundred eighty".