12723309 has 12 divisors (see below), whose sum is σ = 18437952. Its totient is φ = 8454600.

The previous prime is 12723307. The next prime is 12723311. The reversal of 12723309 is 90332721.

It is an interprime number because it is at equal distance from previous prime (12723307) and next prime (12723311).

It is not a de Polignac number, because 12723309 - 2¹ = 12723307 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12723307) 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, 844 + ... + 5114.

It is an arithmetic number, because the mean of its divisors is an integer number (1536496).

Almost surely, 2^12723309 is an apocalyptic number.

It is an amenable number.

12723309 is a deficient number, since it is larger than the sum of its proper divisors (5714643).

12723309 is a wasteful number, since it uses less digits than its factorization.

12723309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608 (or 4605 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 12723309 is about 3566.9747686240. The cubic root of 12723309 is about 233.4533040649.

It can be divided in two parts, 127 and 23309, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 12723309 in words is "twelve million, seven hundred twenty-three thousand, three hundred nine".