12665920 has 28 divisors (see below), whose sum is σ = 30161484. Its totient is φ = 5066240.

The previous prime is 12665869. The next prime is 12665927. The reversal of 12665920 is 2956621.

It can be written as a sum of positive squares in 2 ways, for example, as 6594624 + 6071296 = 2568^2 + 2464^2 .

It is not an unprimeable number, because it can be changed into a prime (12665927) 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, 19471 + ... + 20110.

Almost surely, 2^12665920 is an apocalyptic number.

12665920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12665920 is an abundant number, since it is smaller than the sum of its proper divisors (17495564).

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

12665920 is an equidigital number, since it uses as much as digits as its factorization.

12665920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39598 (or 39588 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 12665920 is about 3558.9211848536. The cubic root of 12665920 is about 233.1017748140.

The spelling of 12665920 in words is "twelve million, six hundred sixty-five thousand, nine hundred twenty".