12720433 has 4 divisors (see below), whose sum is σ = 13876848. Its totient is φ = 11564020.

The previous prime is 12720427. The next prime is 12720439. The reversal of 12720433 is 33402721.

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 an interprime number because it is at equal distance from previous prime (12720427) and next prime (12720439).

It is a cyclic number.

It is not a de Polignac number, because 12720433 - 2¹³ = 12712241 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720439) 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, 578191 + ... + 578212.

It is an arithmetic number, because the mean of its divisors is an integer number (3469212).

Almost surely, 2^12720433 is an apocalyptic number.

It is an amenable number.

12720433 is a deficient number, since it is larger than the sum of its proper divisors (1156415).

12720433 is a wasteful number, since it uses less digits than its factorization.

12720433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156414.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 12720433 is about 3566.5716030945. The cubic root of 12720433 is about 233.4357126690.

The spelling of 12720433 in words is "twelve million, seven hundred twenty thousand, four hundred thirty-three".