12545639 has 4 divisors (see below), whose sum is σ = 12578280. Its totient is φ = 12513000.

The previous prime is 12545633. The next prime is 12545641. The reversal of 12545639 is 93654521.

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 12545639 - 2¹⁶ = 12480103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12545599 and 12545608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12545633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15737 + ... + 16514.

It is an arithmetic number, because the mean of its divisors is an integer number (3144570).

Almost surely, 2^12545639 is an apocalyptic number.

12545639 is a deficient number, since it is larger than the sum of its proper divisors (32641).

12545639 is an equidigital number, since it uses as much as digits as its factorization.

12545639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32640.

The product of its digits is 32400, while the sum is 35.

The square root of 12545639 is about 3541.9823545580. The cubic root of 12545639 is about 232.3615485870.

The spelling of 12545639 in words is "twelve million, five hundred forty-five thousand, six hundred thirty-nine".