12139849 has 2 divisors, whose sum is σ = 12139850. Its totient is φ = 12139848.

The previous prime is 12139847. The next prime is 12139861. The reversal of 12139849 is 94893121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6996025 + 5143824 = 2645^2 + 2268^2 .

It is a cyclic number.

It is not a de Polignac number, because 12139849 - 2¹ = 12139847 is a prime.

Together with 12139847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12139847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6069924 + 6069925.

It is an arithmetic number, because the mean of its divisors is an integer number (6069925).

Almost surely, 2^12139849 is an apocalyptic number.

It is an amenable number.

12139849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12139849 is an equidigital number, since it uses as much as digits as its factorization.

12139849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 12139849 is about 3484.2286090324. The cubic root of 12139849 is about 229.8287887766.

The spelling of 12139849 in words is "twelve million, one hundred thirty-nine thousand, eight hundred forty-nine".