12840733 has 4 divisors (see below), whose sum is σ = 12848508. Its totient is φ = 12832960.

The previous prime is 12840697. The next prime is 12840743. The reversal of 12840733 is 33704821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 33704821 = 23 ⋅1465427.

It can be written as a sum of positive squares in 2 ways, for example, as 5212089 + 7628644 = 2283^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 12840733 - 2¹³ = 12832541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840743) 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, 316 + ... + 5077.

It is an arithmetic number, because the mean of its divisors is an integer number (3212127).

Almost surely, 2^12840733 is an apocalyptic number.

It is an amenable number.

12840733 is a deficient number, since it is larger than the sum of its proper divisors (7775).

12840733 is an equidigital number, since it uses as much as digits as its factorization.

12840733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7774.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 12840733 is about 3583.3968521502. The cubic root of 12840733 is about 234.1692896762.

The spelling of 12840733 in words is "twelve million, eight hundred forty thousand, seven hundred thirty-three".