308247139 has 8 divisors (see below), whose sum is σ = 316107360. Its totient is φ = 300484800.

The previous prime is 308247133. The next prime is 308247151. The reversal of 308247139 is 931742803.

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 308247139 - 2³ = 308247131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 308247098 and 308247107.

It is not an unprimeable number, because it can be changed into a prime (308247131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18072 + ... + 30709.

It is an arithmetic number, because the mean of its divisors is an integer number (39513420).

Almost surely, 2^308247139 is an apocalyptic number.

308247139 is a deficient number, since it is larger than the sum of its proper divisors (7860221).

308247139 is an equidigital number, since it uses as much as digits as its factorization.

308247139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48941.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 308247139 is about 17556.9683886484. The cubic root of 308247139 is about 675.5119218555.

The spelling of 308247139 in words is "three hundred eight million, two hundred forty-seven thousand, one hundred thirty-nine".