139144309 has 8 divisors (see below), whose sum is σ = 144920448. Its totient is φ = 133474320.

The previous prime is 139144301. The next prime is 139144321. The reversal of 139144309 is 903441931.

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

It is not a de Polignac number, because 139144309 - 2³ = 139144301 is a prime.

It is a super-2 number, since 2×139144309² = 38722277454174962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139144301) 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 7 ways as a sum of consecutive naturals, for example, 23857 + ... + 29110.

It is an arithmetic number, because the mean of its divisors is an integer number (18115056).

Almost surely, 2^139144309 is an apocalyptic number.

It is an amenable number.

139144309 is a deficient number, since it is larger than the sum of its proper divisors (5776139).

139144309 is an equidigital number, since it uses as much as digits as its factorization.

139144309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53075.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 139144309 is about 11795.9445997343. The cubic root of 139144309 is about 518.1893497875.

The spelling of 139144309 in words is "one hundred thirty-nine million, one hundred forty-four thousand, three hundred nine".