308269139 has 4 divisors (see below), whose sum is σ = 312171360. Its totient is φ = 304366920.

The previous prime is 308269111. The next prime is 308269153. The reversal of 308269139 is 931962803.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 308269139 - 2²⁸ = 39833683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 308269096 and 308269105.

It is not an unprimeable number, because it can be changed into a prime (308269439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950992 + ... + 1951149.

It is an arithmetic number, because the mean of its divisors is an integer number (78042840).

Almost surely, 2^308269139 is an apocalyptic number.

308269139 is a deficient number, since it is larger than the sum of its proper divisors (3902221).

308269139 is an equidigital number, since it uses as much as digits as its factorization.

308269139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3902220.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 308269139 is about 17557.5949093263. The cubic root of 308269139 is about 675.5279921953.

The spelling of 308269139 in words is "three hundred eight million, two hundred sixty-nine thousand, one hundred thirty-nine".