139246209 has 40 divisors (see below), whose sum is σ = 222469632. Its totient is φ = 86581440.

The previous prime is 139246189. The next prime is 139246223. The reversal of 139246209 is 902642931.

139246209 is a `hidden beast` number, since 1 + 3 + 9 + 24 + 620 + 9 = 666.

It is not a de Polignac number, because 139246209 - 2¹² = 139242113 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139246109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 75472 + ... + 77294.

Almost surely, 2^139246209 is an apocalyptic number.

It is an amenable number.

139246209 is a deficient number, since it is larger than the sum of its proper divisors (83223423).

139246209 is a wasteful number, since it uses less digits than its factorization.

139246209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 139246209 is about 11800.2630902874. The cubic root of 139246209 is about 518.3158146796.

The spelling of 139246209 in words is "one hundred thirty-nine million, two hundred forty-six thousand, two hundred nine".