12840727 has 4 divisors (see below), whose sum is σ = 13254976. Its totient is φ = 12426480.

The previous prime is 12840697. The next prime is 12840743. The reversal of 12840727 is 72704821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72704821 = 7 ⋅10386403.

It is a cyclic number.

It is not a de Polignac number, because 12840727 - 2¹⁵ = 12807959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 414217 = 12840727 / (1 + 2 + 8 + 4 + 0 + 7 + 2 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840427) 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, 207078 + ... + 207139.

It is an arithmetic number, because the mean of its divisors is an integer number (3313744).

Almost surely, 2^12840727 is an apocalyptic number.

12840727 is a deficient number, since it is larger than the sum of its proper divisors (414249).

12840727 is an equidigital number, since it uses as much as digits as its factorization.

12840727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414248.

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

The square root of 12840727 is about 3583.3960149556. The cubic root of 12840727 is about 234.1692532033.

The spelling of 12840727 in words is "twelve million, eight hundred forty thousand, seven hundred twenty-seven".