12509749 has 12 divisors (see below), whose sum is σ = 14829804. Its totient is φ = 10518144.

The previous prime is 12509747. The next prime is 12509753. The reversal of 12509749 is 94790521.

It can be written as a sum of positive squares in 2 ways, for example, as 4708900 + 7800849 = 2170^2 + 2793^2 .

It is not a de Polignac number, because 12509749 - 2¹ = 12509747 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 (12509741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189 + ... + 5005.

It is an arithmetic number, because the mean of its divisors is an integer number (1235817).

Almost surely, 2^12509749 is an apocalyptic number.

It is an amenable number.

12509749 is a deficient number, since it is larger than the sum of its proper divisors (2320055).

12509749 is an equidigital number, since it uses as much as digits as its factorization.

12509749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884 (or 4877 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 12509749 is about 3536.9123540173. The cubic root of 12509749 is about 232.1397604681.

The spelling of 12509749 in words is "twelve million, five hundred nine thousand, seven hundred forty-nine".