12780239 has 4 divisors (see below), whose sum is σ = 12806760. Its totient is φ = 12753720.

The previous prime is 12780223. The next prime is 12780247. The reversal of 12780239 is 93208721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93208721 = 89 ⋅1047289.

It is a cyclic number.

It is not a de Polignac number, because 12780239 - 2⁴ = 12780223 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 (12780269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12524 + ... + 13505.

It is an arithmetic number, because the mean of its divisors is an integer number (3201690).

Almost surely, 2^12780239 is an apocalyptic number.

12780239 is a deficient number, since it is larger than the sum of its proper divisors (26521).

12780239 is an equidigital number, since it uses as much as digits as its factorization.

12780239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26520.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 12780239 is about 3574.9460135784. The cubic root of 12780239 is about 233.8009789009.

The spelling of 12780239 in words is "twelve million, seven hundred eighty thousand, two hundred thirty-nine".