12812789 has 4 divisors (see below), whose sum is σ = 13977600. Its totient is φ = 11647980.

The previous prime is 12812777. The next prime is 12812791. The reversal of 12812789 is 98721821.

12812789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98721821 = 11 ⋅8974711.

It is a cyclic number.

It is not a de Polignac number, because 12812789 - 2¹⁶ = 12747253 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 (12812729) 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, 582389 + ... + 582410.

It is an arithmetic number, because the mean of its divisors is an integer number (3494400).

Almost surely, 2^12812789 is an apocalyptic number.

It is an amenable number.

12812789 is a deficient number, since it is larger than the sum of its proper divisors (1164811).

12812789 is a wasteful number, since it uses less digits than its factorization.

12812789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164810.

The product of its digits is 16128, while the sum is 38.

The square root of 12812789 is about 3579.4956348625. The cubic root of 12812789 is about 233.9992999224. Note that the first 3 decimals are identical.

The spelling of 12812789 in words is "twelve million, eight hundred twelve thousand, seven hundred eighty-nine".