308428847 has 4 divisors (see below), whose sum is σ = 309812160. Its totient is φ = 307045536.

The previous prime is 308428837. The next prime is 308428849. The reversal of 308428847 is 748824803.

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 308428847 - 2⁴ = 308428831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 308428798 and 308428807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308428849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691322 + ... + 691767.

It is an arithmetic number, because the mean of its divisors is an integer number (77453040).

Almost surely, 2^308428847 is an apocalyptic number.

308428847 is a deficient number, since it is larger than the sum of its proper divisors (1383313).

308428847 is a wasteful number, since it uses less digits than its factorization.

308428847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383312.

The product of its (nonzero) digits is 344064, while the sum is 44.

The square root of 308428847 is about 17562.1424376413. The cubic root of 308428847 is about 675.6446311804.

The spelling of 308428847 in words is "three hundred eight million, four hundred twenty-eight thousand, eight hundred forty-seven".