12549839 has 4 divisors (see below), whose sum is σ = 12557640. Its totient is φ = 12542040.

The previous prime is 12549809. The next prime is 12549847. The reversal of 12549839 is 93894521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93894521 = 7 ⋅13413503.

It is a cyclic number.

It is not a de Polignac number, because 12549839 - 2⁸ = 12549583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12549796 and 12549805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12549809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497 + ... + 5034.

It is an arithmetic number, because the mean of its divisors is an integer number (3139410).

Almost surely, 2^12549839 is an apocalyptic number.

12549839 is a deficient number, since it is larger than the sum of its proper divisors (7801).

12549839 is an equidigital number, since it uses as much as digits as its factorization.

12549839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800.

The product of its digits is 77760, while the sum is 41.

The square root of 12549839 is about 3542.5751932740. The cubic root of 12549839 is about 232.3874755145.

The spelling of 12549839 in words is "twelve million, five hundred forty-nine thousand, eight hundred thirty-nine".