139686849 has 24 divisors (see below), whose sum is σ = 211312192. Its totient is φ = 92203920.

The previous prime is 139686839. The next prime is 139686857. The reversal of 139686849 is 948686931.

It is not a de Polignac number, because 139686849 - 2⁵ = 139686817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139686795 and 139686804.

It is not an unprimeable number, because it can be changed into a prime (139686829) 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 in 23 ways as a sum of consecutive naturals, for example, 22239 + ... + 27819.

Almost surely, 2^139686849 is an apocalyptic number.

It is an amenable number.

139686849 is a deficient number, since it is larger than the sum of its proper divisors (71625343).

139686849 is an equidigital number, since it uses as much as digits as its factorization.

139686849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5699 (or 5687 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 139686849 is about 11818.9191130154. The cubic root of 139686849 is about 518.8619700430.

The spelling of 139686849 in words is "one hundred thirty-nine million, six hundred eighty-six thousand, eight hundred forty-nine".