12665740 has 12 divisors (see below), whose sum is σ = 26598096. Its totient is φ = 5066288.

The previous prime is 12665713. The next prime is 12665743. The reversal of 12665740 is 4756621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12665743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316624 + ... + 316663.

It is an arithmetic number, because the mean of its divisors is an integer number (2216508).

Almost surely, 2^12665740 is an apocalyptic number.

12665740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12665740 is an abundant number, since it is smaller than the sum of its proper divisors (13932356).

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

12665740 is a wasteful number, since it uses less digits than its factorization.

12665740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633296 (or 633294 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 12665740 is about 3558.8958962015. The cubic root of 12665740 is about 233.1006705773.

The spelling of 12665740 in words is "twelve million, six hundred sixty-five thousand, seven hundred forty".