139643009 has 8 divisors (see below), whose sum is σ = 152425152. Its totient is φ = 126875440.

The previous prime is 139642999. The next prime is 139643039. The reversal of 139643009 is 900346931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139643009 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 139643009.

It is not an unprimeable number, because it can be changed into a prime (139643039) 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, 29747 + ... + 34119.

It is an arithmetic number, because the mean of its divisors is an integer number (19053144).

Almost surely, 2^139643009 is an apocalyptic number.

It is an amenable number.

139643009 is a deficient number, since it is larger than the sum of its proper divisors (12782143).

139643009 is a wasteful number, since it uses less digits than its factorization.

139643009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7287.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 139643009 is about 11817.0643139487. The cubic root of 139643009 is about 518.8076836421.

The spelling of 139643009 in words is "one hundred thirty-nine million, six hundred forty-three thousand, nine".