12147309 has 6 divisors (see below), whose sum is σ = 17546126. Its totient is φ = 8098200.

The previous prime is 12147293. The next prime is 12147323. The reversal of 12147309 is 90374121.

It can be written as a sum of positive squares in only one way, i.e., 9474084 + 2673225 = 3078^2 + 1635^2 .

It is not a de Polignac number, because 12147309 - 2⁴ = 12147293 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 (12140309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 674842 + ... + 674859.

Almost surely, 2^12147309 is an apocalyptic number.

It is an amenable number.

12147309 is a deficient number, since it is larger than the sum of its proper divisors (5398817).

12147309 is a wasteful number, since it uses less digits than its factorization.

12147309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349707 (or 1349704 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 12147309 is about 3485.2989828708. The cubic root of 12147309 is about 229.8758561301.

The spelling of 12147309 in words is "twelve million, one hundred forty-seven thousand, three hundred nine".