12840929 has 4 divisors (see below), whose sum is σ = 12854976. Its totient is φ = 12826884.

The previous prime is 12840911. The next prime is 12840931. The reversal of 12840929 is 92904821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12840929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12800929) 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, 5549 + ... + 7514.

It is an arithmetic number, because the mean of its divisors is an integer number (3213744).

Almost surely, 2^12840929 is an apocalyptic number.

It is an amenable number.

12840929 is a deficient number, since it is larger than the sum of its proper divisors (14047).

12840929 is an equidigital number, since it uses as much as digits as its factorization.

12840929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14046.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 12840929 is about 3583.4242003983. The cubic root of 12840929 is about 234.1704811177.

The spelling of 12840929 in words is "twelve million, eight hundred forty thousand, nine hundred twenty-nine".