12809749 has 4 divisors (see below), whose sum is σ = 12990240. Its totient is φ = 12629260.

The previous prime is 12809747. The next prime is 12809759. The reversal of 12809749 is 94790821.

12809749 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: 94790821 = 29 ⋅3268649.

It is a cyclic number.

It is not a de Polignac number, because 12809749 - 2¹ = 12809747 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 (12809747) 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, 90139 + ... + 90280.

It is an arithmetic number, because the mean of its divisors is an integer number (3247560).

Almost surely, 2^12809749 is an apocalyptic number.

It is an amenable number.

12809749 is a deficient number, since it is larger than the sum of its proper divisors (180491).

12809749 is an equidigital number, since it uses as much as digits as its factorization.

12809749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180490.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 12809749 is about 3579.0709688409. The cubic root of 12809749 is about 233.9807920046.

The spelling of 12809749 in words is "twelve million, eight hundred nine thousand, seven hundred forty-nine".