12309639 has 4 divisors (see below), whose sum is σ = 16412856. Its totient is φ = 8206424.

The previous prime is 12309637. The next prime is 12309707. The reversal of 12309639 is 93690321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12309639 - 2¹ = 12309637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051604 + ... + 2051609.

It is an arithmetic number, because the mean of its divisors is an integer number (4103214).

Almost surely, 2^12309639 is an apocalyptic number.

12309639 is a deficient number, since it is larger than the sum of its proper divisors (4103217).

12309639 is an equidigital number, since it uses as much as digits as its factorization.

12309639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103216.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 12309639 is about 3508.5095125993. The cubic root of 12309639 is about 230.8953068434.

The spelling of 12309639 in words is "twelve million, three hundred nine thousand, six hundred thirty-nine".