305247138 has 32 divisors (see below), whose sum is σ = 738751104. Its totient is φ = 82083072.

The previous prime is 305247119. The next prime is 305247143. The reversal of 305247138 is 831742503.

It is a junction number, because it is equal to n+sod(n) for n = 305247099 and 305247108.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 213045 + ... + 214472.

It is an arithmetic number, because the mean of its divisors is an integer number (23085972).

Almost surely, 2^305247138 is an apocalyptic number.

305247138 is an abundant number, since it is smaller than the sum of its proper divisors (433503966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

305247138 is a wasteful number, since it uses less digits than its factorization.

305247138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427546.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 305247138 is about 17471.3233042034. The cubic root of 305247138 is about 673.3133108991.

The spelling of 305247138 in words is "three hundred five million, two hundred forty-seven thousand, one hundred thirty-eight".