139886209 has 4 divisors (see below), whose sum is σ = 140125104. Its totient is φ = 139647316.

The previous prime is 139886143. The next prime is 139886261. The reversal of 139886209 is 902688931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139886209 - 2¹⁷ = 139755137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139886609) 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 3 ways as a sum of consecutive naturals, for example, 118567 + ... + 119740.

It is an arithmetic number, because the mean of its divisors is an integer number (35031276).

Almost surely, 2^139886209 is an apocalyptic number.

It is an amenable number.

139886209 is a deficient number, since it is larger than the sum of its proper divisors (238895).

139886209 is an equidigital number, since it uses as much as digits as its factorization.

139886209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238894.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 139886209 is about 11827.3500413237. The cubic root of 139886209 is about 519.1086913159.

The spelling of 139886209 in words is "one hundred thirty-nine million, eight hundred eighty-six thousand, two hundred nine".