12309749 has 2 divisors, whose sum is σ = 12309750. Its totient is φ = 12309748.

The previous prime is 12309721. The next prime is 12309763. The reversal of 12309749 is 94790321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 5207524 = 2665^2 + 2282^2 .

It is a cyclic number.

It is not a de Polignac number, because 12309749 - 2¹² = 12305653 is a prime.

It is a super-3 number, since 3×12309749³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12309719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6154874 + 6154875.

It is an arithmetic number, because the mean of its divisors is an integer number (6154875).

Almost surely, 2^12309749 is an apocalyptic number.

It is an amenable number.

12309749 is a deficient number, since it is larger than the sum of its proper divisors (1).

12309749 is an equidigital number, since it uses as much as digits as its factorization.

12309749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 12309749 is about 3508.5251887367. The cubic root of 12309749 is about 230.8959946082.

The spelling of 12309749 in words is "twelve million, three hundred nine thousand, seven hundred forty-nine".