12921760 has 24 divisors (see below), whose sum is σ = 30528036. Its totient is φ = 5168640.

The previous prime is 12921679. The next prime is 12921763. The reversal of 12921760 is 6712921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 559504 = 3516^2 + 748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921763) 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, 40221 + ... + 40540.

Almost surely, 2^12921760 is an apocalyptic number.

12921760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12921760 is an abundant number, since it is smaller than the sum of its proper divisors (17606276).

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

12921760 is an equidigital number, since it uses as much as digits as its factorization.

12921760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80776 (or 80768 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 12921760 is about 3594.6849653342. The cubic root of 12921760 is about 234.6608053518.

The spelling of 12921760 in words is "twelve million, nine hundred twenty-one thousand, seven hundred sixty".