12840181 has 8 divisors (see below), whose sum is σ = 13657280. Its totient is φ = 12037248.

The previous prime is 12840133. The next prime is 12840193. The reversal of 12840181 is 18104821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12840181 - 2¹⁵ = 12807413 is a prime.

It is a super-2 number, since 2×12840181² = 329740496225522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1641 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (1707160).

Almost surely, 2^12840181 is an apocalyptic number.

It is an amenable number.

12840181 is a deficient number, since it is larger than the sum of its proper divisors (817099).

12840181 is an equidigital number, since it uses as much as digits as its factorization.

12840181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7083.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 12840181 is about 3583.3198294319. The cubic root of 12840181 is about 234.1659341227.

The spelling of 12840181 in words is "twelve million, eight hundred forty thousand, one hundred eighty-one".