12609729 has 16 divisors (see below), whose sum is σ = 20379840. Its totient is φ = 7642080.

The previous prime is 12609713. The next prime is 12609731. The reversal of 12609729 is 92790621.

It is not a de Polignac number, because 12609729 - 2⁴ = 12609713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12609693 and 12609702.

It is not an unprimeable number, because it can be changed into a prime (12609029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20932 + ... + 21525.

It is an arithmetic number, because the mean of its divisors is an integer number (1273740).

Almost surely, 2^12609729 is an apocalyptic number.

It is an amenable number.

12609729 is a deficient number, since it is larger than the sum of its proper divisors (7770111).

12609729 is a wasteful number, since it uses less digits than its factorization.

12609729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42477 (or 42471 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 12609729 is about 3551.0180230463. The cubic root of 12609729 is about 232.7565534291.

The spelling of 12609729 in words is "twelve million, six hundred nine thousand, seven hundred twenty-nine".