12727840 has 24 divisors (see below), whose sum is σ = 30069900. Its totient is φ = 5091072.

The previous prime is 12727837. The next prime is 12727843. The reversal of 12727840 is 4872721.

It is an interprime number because it is at equal distance from previous prime (12727837) and next prime (12727843).

It can be written as a sum of positive squares in 2 ways, for example, as 11587216 + 1140624 = 3404^2 + 1068^2 .

It is a super-2 number, since 2×12727840² = 323995822131200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12727843) 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, 39615 + ... + 39934.

Almost surely, 2^12727840 is an apocalyptic number.

12727840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12727840 is an abundant number, since it is smaller than the sum of its proper divisors (17342060).

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

12727840 is an equidigital number, since it uses as much as digits as its factorization.

12727840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79564 (or 79556 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 12727840 is about 3567.6098441394. The cubic root of 12727840 is about 233.4810130878.

The spelling of 12727840 in words is "twelve million, seven hundred twenty-seven thousand, eight hundred forty".