139788209 has 8 divisors (see below), whose sum is σ = 154427520. Its totient is φ = 125470800.

The previous prime is 139788203. The next prime is 139788239. The reversal of 139788209 is 902887931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139788209 - 2⁴ = 139788193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139788203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79562 + ... + 81299.

It is an arithmetic number, because the mean of its divisors is an integer number (19303440).

Almost surely, 2^139788209 is an apocalyptic number.

It is an amenable number.

139788209 is a deficient number, since it is larger than the sum of its proper divisors (14639311).

139788209 is a wasteful number, since it uses less digits than its factorization.

139788209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160951.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 139788209 is about 11823.2063755988. The cubic root of 139788209 is about 518.9874391051.

The spelling of 139788209 in words is "one hundred thirty-nine million, seven hundred eighty-eight thousand, two hundred nine".